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Old 02-02-2013, 10:52 AM   #1
morris05GTO
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LS3 conversion low dyno #'s track times.........

Starting a new thread from my last 1, the ls3 conversion check list. Well as in the last thread i had everything installed and got dynoed and came out upset with the #'s. 422rwhp/370rwtq. Went to the track last night and ran
1/4-12.0 at 114mph 1.7 60'.......did it 3 times in a row. Im kinda happy that i ran my fastest time yet but also dissapointed that its not where im suppose to be with my new mods. Was hoping mid-high 11's. My trap speed is still the same as my last setup so i think im losing topend power somewhere. Ill post the dyno sheet and my track slip...............help diagnose the problem
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Old 02-02-2013, 10:55 AM   #2
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Stock injectors? What's the injector duty cycle?
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Old 02-02-2013, 11:09 AM   #3
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So, you went from a LS2 6.0 to a LS3 6.2 and are wondering why you don't have a John Force timeslip? Which MAF are you using and probably more importantly, did you have it retuned?
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Old 02-02-2013, 11:18 AM   #4
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Quote:
Originally Posted by batboy...View Post
So, you went from a LS2 6.0 to a LS3 6.2 and are wondering why you don't have a John Force timeslip? Which MAF are you using and probably more importantly, did you have it retuned?

I am assuming he means LS3 top end, and his SIG says he has a custom cam.
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Old 02-02-2013, 11:37 AM   #5
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Ok, that makes more sense. The LS3 heads aren't the best on a 4" bore, too much valve shrouding. They work better on larger bore motors. Even then, they have big heavy valves. What compression ratio are you using or in other words, did you do any milling?
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Old 02-02-2013, 11:45 AM   #6
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LS3 conversion low dyno #'s track times.........

Seems slow for a H/C LS2. I have non-ported stock 243's from an 06 GTO with a cam and ran 11.7 @ 122 with 1.7 60'.


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Old 02-02-2013, 11:46 AM   #7
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Quote:
Originally Posted by batboy...View Post
Ok, that makes more sense. The LS3 heads aren't the best on a 4" bore, too much valve shrouding. They work better on larger bore motors. Even then, they have big heavy valves. What compression ratio are you using or in other words, did you do any milling?


They are the street/strip heads from ed curtis, i wanted them milled not sure if he did or not. And yes its a LS3 top end, ported manifold/ported heads. Pretty much all ED Curtis work on top end, still have stock TB and maf sensor from ls2. Im trying to put up the pics but the sight wont let me upload for some reason
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Old 02-02-2013, 11:50 AM   #8
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Quote:
Originally Posted by tuboy19...View Post
Stock injectors? What's the injector duty cycle?

LS3 injectors 42#
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Old 02-02-2013, 12:32 PM   #9
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Something is definitely off man, how big is your cam? What kind of head gasket did you use? Whats was your AFR? Any idea how much timing your tune is allowing?

We have near identical setups so we should be in the ballpark of each others numbers.....
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Old 02-02-2013, 12:35 PM   #10
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Post your dyno sheet.
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Old 02-02-2013, 12:39 PM   #11
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Does your tuner know how to tune a LS3 MAF? I have a LS1 with ported 243 heads, 230/236 cam, and full bolt-ons which made 430 hp (stalled A4 like you). A 100mm MAF and 4" air intake made 23 hp and 18 tq.
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Old 02-02-2013, 12:59 PM   #12
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LS3 heads dont seem to make the best numbers on LS2 blocks. Take me for example. Bought the best LS3 heads you can buy with a ported L76 intake and a Ed C cam and only made 510/468. I see guys making more with the cathedral port Trickflows. Now my 402 with LS3 heads is making more than most 402's but the $/HP ratio is low.
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Old 02-02-2013, 01:14 PM   #13
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Quote:
Originally Posted by morris05GTO...View Post
Starting a new thread from my last 1, the ls3 conversion check list. Well as in the last thread i had everything installed and got dynoed and came out upset with the #'s. 422rwhp/370rwtq. Went to the track last night and ran
1/4-12.0 at 114mph 1.7 60'.......did it 3 times in a row. Im kinda happy that i ran my fastest time yet but also dissapointed that its not where im suppose to be with my new mods. Was hoping mid-high 11's. My trap speed is still the same as my last setup so i think im losing topend power somewhere. Ill post the dyno sheet and my track slip...............help diagnose the problem



Dyno numbers seem about right, our LS3 only made 428rwhp on a DynoJet 248C.

But your track time is way off!
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Old 02-02-2013, 01:43 PM   #14
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Quote:
Originally Posted by 6point0 goat...View Post
Something is definitely off man, how big is your cam? What kind of head gasket did you use? Whats was your AFR? Any idea how much timing your tune is allowing?

We have near identical setups so we should be in the ballpark of each others numbers.....

231/240 617/610 cam, tune is good. Forgot which head gasket my mechanic used
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Old 02-02-2013, 01:45 PM   #15
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Quote:
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Post your dyno sheet.

Im trying to post it but the website isnt allowing it at the time for some reason...........when you see the sheet youll see the hp line going up and then taking a dip down around 5000rpms and going back up around 5500 rpms. Somethin with the locking and unlocking on convertor
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Old 02-02-2013, 01:50 PM   #16
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You can email it to me and I'll post it if you like
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Old 02-02-2013, 01:53 PM   #17
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I went 11.70's at 114 MPH so it's not working on the front half of the track. Something is amiss. Email me the dyno sheets and the fuel curve.

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Old 02-02-2013, 01:57 PM   #18
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With a 1.7 60', his ET matches his trap speed pretty dead nuts IMO.

LS3 heads are just not that great on LS2 blocks IMO.
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Old 02-02-2013, 02:02 PM   #19
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I went 11.70's at 114 MPH so it's not working on the front half of the track. Something is amiss. Email me the dyno sheets and the fuel curve.

Ed

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Old 02-02-2013, 02:10 PM   #20
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Old 02-02-2013, 02:16 PM   #21
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^^ thanks man
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Old 02-02-2013, 02:56 PM   #22
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Quote:
Originally Posted by mchicia1...View Post

LS3 heads are just not that great on LS2 blocks IMO.

Yep,seen too many LS3 heads on LS2 blocks with poor dyno numbers to think otherwise.
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Old 02-02-2013, 03:07 PM   #23
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I would not put a lot of faith in that dyno pass. Surely you have more than one and hopefully a clean pass. I'm not seeing AFR? Dynojet huh and STD not SAE? Wow, something ain't right. On the other hand, low gears do dyno a little low.

I've seen time after time catherdral heads equal or beat L92 heads on a 4" bore. I'm putting down more to the rollers than that with 243 heads and a smaller cam and a LS1.

Last edited by batboy; 02-02-2013 at 03:12 PM.
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Old 02-02-2013, 04:09 PM   #24
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Quote:
Originally Posted by mchicia1...View Post
With a 1.7 60', his ET matches his trap speed pretty dead nuts IMO.

LS3 heads are just not that great on LS2 blocks IMO.

OK - if you say so -
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Old 02-02-2013, 04:49 PM   #25
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Quote:
Originally Posted by mchicia1...View Post
With a 1.7 60', his ET matches his trap speed pretty dead nuts IMO.

LS3 heads are just not that great on LS2 blocks IMO.

Yeah they are just awful......

Op, how is your trans? After my ls3 top end I was only running 11.90's@114. Put a new trans in the car and picked up almost 5 mph in similar conditions.
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Old 02-02-2013, 06:06 PM   #26
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Ok, that makes more sense. The LS3 heads aren't the best on a 4" bore, too much valve shrouding. They work better on larger bore motors. Even then, they have big heavy valves.

LS3 valves have the lighter ones haas on the intake.


Its not that LS3 heads aren't best, you just have to know what you are doing. The margin of error is greater especially when understanding how the valve events work with the function and design of the valves and port of the LS3 head.

You cannot just grab a cam that you saw Joe Blow run or some cam guesser who runs a few cam designs on his desktop dyno and think that the combination is going to work. If you want that you can just order a cam from Tick's new cam guru Pat G Jr.

I find that only people talking about LS3 heads are crap are the people who have slow cars or cannot make power with them.
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Old 02-02-2013, 07:06 PM   #27
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Originally Posted by AutomaticWpn06...View Post
Yeah they are just awful......

Op, how is your trans? After my ls3 top end I was only running 11.90's@114. Put a new trans in the car and picked up almost 5 mph in similar conditions.

They're not awful, but they aren't as good as a ported cathedral or aftermarket head for an LS2, sorry.

With that being said, I would still expect more than 420 hp and a 114 mph trap, so maybe there is an install or tune issue going on here.

Last edited by Jaime Lannister; 02-02-2013 at 07:08 PM.
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Old 02-02-2013, 07:42 PM   #28
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Quote:
Originally Posted by mchicia1...View Post
They're not awful, but they aren't as good as a ported cathedral or aftermarket head for an LS2, sorry.

I'll give you that.
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Old 02-02-2013, 08:05 PM   #29
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Quote:
Originally Posted by dyno junkie...View Post
Dyno numbers seem about right, our LS3 only made 428rwhp on a DynoJet 248C.

But your track time is way off!

I guess I need a driver mod then ...

Quote:
Originally Posted by mchicia1...View Post
With a 1.7 60', his ET matches his trap speed pretty dead nuts IMO.

LS3 heads are just not that great on LS2 blocks IMO.

I agree with the math portion of this statement. His dyno numbers to me seem low but his track times are about on par with the power he is currently making with a full or close to full weight gto. Obviously if he makes the power he was expecting, (450 ish) then he would improve his e.t.'s and be more where he wanted. I see a bunch of low 400rwhp cars on here right in that 11.8-12.2 range with 1.75 to 1.85 60's trapping right about where you did or a touch higher.
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Old 02-03-2013, 03:57 AM   #30
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Quote:
Originally Posted by bozzhawg...View Post
LS3 valves have the lighter ones haas on the intake.


Its not that LS3 heads aren't best, you just have to know what you are doing. The margin of error is greater especially when understanding how the valve events work with the function and design of the valves and port of the LS3 head.

You cannot just grab a cam that you saw Joe Blow run or some cam guesser who runs a few cam designs on his desktop dyno and think that the combination is going to work. If you want that you can just order a cam from Tick's new cam guru Pat G Jr.

I find that only people talking about LS3 heads are crap are the people who have slow cars or cannot make power with them.



Agee about LS3 heads.
Here in Western Australia there are several mid to low 11 second LS3 headed LS2 and at least one 10 second street car with the combo.
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