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GR-RRR!
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4,291 Posts
Discussion Starter #1
The performance modifications are modest:

-ported LS2 throttle body
-25% SLP underdrive crank pulley
-JBA shorty headers
-JBA high flow cats
-Magnaflow catback
-Fast 102 LSXR intake manifold (port matched by me)
-DuSpeed intake with a K&N filter
-relocated fast read IAT sensor
-NGK TR6 spark plugs

Runs on 91 octane pure gas (no alcohol). Runs and drives real nice.

Results: 379 rwhp read by a DynoJet dyno with the 2019 software (was told the newer software reads lower than older software). I don't know about that, but it drives nice, pulls hard for what it is. Can't wait to get it back to the track or to strap on my G-Tech and see if is any quicker.

Unfortunately he was unable to get a before HP reading as it was running way too lean at anything above 3000 RPMs to give it a WOT run on the stock tune. It was about 90 degrees out when the tuning was done.

I'll add a link to the Youtibe video posted when it is done loading.
 

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GR-RRR!
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4,291 Posts
Discussion Starter #5
I'm not sure what is going on with the link to the YT video, but some automatic editor must be changing the address, I can't post the correct address no matter what I do.

Just search Youtube for "2006 GTO modest bolt-ons dyno run"
 

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GR-RRR!
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Discussion Starter #6

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My other car has wings
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Add a modest cam like I did and you'll be north of 400 rwhp.
 

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GR-RRR!
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4,291 Posts
Discussion Starter #9
that's odd.

i wonder what vendor that was to get replaced with non-sponsor. i've never heard of them.
No clue. The characters in the URL that were getting replaced by "Non-Vendor" were "f-l-P" (minus the hyphens, it wouldn't even let me type those three letters alone!)
 

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The battle of wits has begun.
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2,278 Posts
Yeah this website deletes specific words / character strings for who knows what reason. That said, your GTO looks terrific. What was the tq? Do you have the dyno graph?
 

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GR-RRR!
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Discussion Starter #11
Yeah this website deletes specific words / character strings for who knows what reason. That said, your GTO looks terrific. What was the tq? Do you have the dyno graph?
I asked for a torque number and graph and was told they need to get a software update to get that. I did get a HP graph, I'll try to post it later.
 

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Great numbers for your mods.

Were you on the stock tune, or your previous mail-order tune for the initial run where you said you were too lean above 3k rpm? Sort of odd to know the car was super lean on a stock tune with your mods. That said, an OTR combined with a FAST 102 should pull a good amount of air.
 

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GR-RRR!
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Discussion Starter #13
Great numbers for your mods.

Were you on the stock tune, or your previous mail-order tune for the initial run where you said you were too lean above 3k rpm? Sort of odd to know the car was super lean on a stock tune with your mods. That said, an OTR combined with a FAST 102 should pull a good amount of air.
I had put it back to the stock tune. It seemed to run fine, but the wideband doesn't lie. But I'm glad I didn't drive it much with the stock tune back in it. Pretty much just the 5-6 miles to the tuner. But I've always heard that the stock tune is actually overly rich, so it is kind of odd that it was running lean. Perhaps the combination of headers and a much better intake system explain it.
 

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Not bad at all. I made 368hp to the wheels with a Vararam CAI, and JBA shorties into cat-less mids. With long-tube headers I picked up 10 more and I suspect you will pick up another 10-12 at the wheels as well. I am also very surprised to hear that you were running lean on the stock tune with those bolt-ons. Enjoy that new power, and save up for some headers and a cam.
 

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ಠ_ಠ
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I had put it back to the stock tune. It seemed to run fine, but the wideband doesn't lie. But I'm glad I didn't drive it much with the stock tune back in it. Pretty much just the 5-6 miles to the tuner. But I've always heard that the stock tune is actually overly rich, so it is kind of odd that it was running lean. Perhaps the combination of headers and a much better intake system explain it.
Do you run a MAF?

ir can be a crapshoot sometimes. Whatever the MAF tells the ECM, it believes it unless it is so out of range it triggers a fault.

I don't really think MAF cals are always accurate. It seems as though they need to be tweaked for just about every car, and even after you swap in a different MAF sensor.

What may have been fine with less mods, may not now be once the MAF is reporting a different frequency because of added airflow.

I really like MAF tuning, but without a wideband, it can be a guessing game at WOT.
 

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GR-RRR!
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Discussion Starter #17
Do you run a MAF?

ir can be a crapshoot sometimes. Whatever the MAF tells the ECM, it believes it unless it is so out of range it triggers a fault.

I don't really think MAF cals are always accurate. It seems as though they need to be tweaked for just about every car, and even after you swap in a different MAF sensor.

What may have been fine with less mods, may not now be once the MAF is reporting a different frequency because of added airflow.

I really like MAF tuning, but without a wideband, it can be a guessing game at WOT.
Yep, have a MAF, the original to this car. The DuSpeed puts it very close to the TB though. Didn't seem to cause any problems though. I do have a relocated fast acting IAT sensor, don't know if that matters any.
 

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ಠ_ಠ
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Yep, have a MAF, the original to this car. The DuSpeed puts it very close to the TB though. Didn't seem to cause any problems though. I do have a relocated fast acting IAT sensor, don't know if that matters any.
relocating it could have changed how it reads as well. it just needed a tune.

when i swapped on my FAST to my 04, i didn't need to retune, but the LS2 MAF swap /MAF cal/OTR was already done.
 

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GR-RRR!
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Discussion Starter #19
HP curve. They didn't give me a torque curve graph.
 

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Is that FWD?
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HP curve. They didn't give me a torque curve graph.
Nice numbers. I have full JBA setup, LS6 heads/cam/fast102, TB, MAF, 3200 stall, etc. Mine came in at 437rwhp, but then I went to 1 piece carbon fiber driveshaft and lightweight rims, I would like to dyno it again to see if I gained any.
 
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