I am posting these on behalf of Jim Bowra

It is nice to see the Fiero Store Big Bore Throttle body tested back to back on the dyno as well.

Ok these are forwarded to me from Jim Bowra, . They recently had several cars taken and put on a Chassis Dyno, which included a 3.4, a 3.1 a stock 2.8 and a Highly Modified 2.9 which is now owned by Todd. I have much more detailed information including the AFR spread data, HP by rpm in excel spreadsheet as well. If people want that info I'll put up a download link for it. Take into consideration that these are "Wheel" HP numbers NOT crank numbers, so you should add 15-18% for an estimate of what the engine is making at the crank. Also they did not tune the engines, so these are baseline numbers. They did feel the 2.9 had an issue as it was dropping power dramatically at 5300 for some reason. Also note ALL the Motors were showing to be running very rich, except the stock 2.8

http://captfiero.com/dynos has the 2 excel files, they are huge, well huge for excel. 4mb for one of them, they have all the raw data including the AFR data.

Well here are the sheets.







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85GT Soon to be 87GT,93 Eldorado 4.9, 5spd Dual O2 Custom Chip, Custom Exhaust. MSD Everything Capt Fiero --- My Over View Cadero Pics Yellow 88GT 5spd Full Poly Suspension, Lowered 1/2" in front, Corner Carver.

[This message has been edited by Capt Fiero (edited 08-18-2010).]

Thanks Capt for posting this. I will update this with the two 3.4s in progress when they are done and broken in. With all the projects that I have, I am probably several months away from completing mine.

great stuff!

Good set of data. Thanks for posting it.

However, there are apparent errors in the tabular data:

- The peak torque for Bill's 3.4 occurs at a higher rpm than the peak power. Mathematically impossible. (197 ft-lb at 4300 rpm = 164 hp)

- The peak torque and peak power Jim's 2.8 BB occur at the same rpm. Highly unlikely. (163 ft-lb at 4300 rpm = 136 hp)

The torque curves do appear to be more reasonable, however. Perhaps the tabular data were just incorrectly transcribed ... e.g. the torque peak for Bill's 3.4 appears to be at about 3300 rpm, not 4300.

Very nice there Jim. Great to talk with you at Fiero Fest. You are a class act there sir. We all are looking for the most, and with your help, we are closer to our goals.

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It is interesting to see the 3.4 curve plotted against the 2.8 and 3.1. It's really clear how the 3.4 runs out of breath on the top end due to the poor flowing intakes.

I would like to see a 3.4 with a trueleo intake and headers. I'm more than willing to bet it will help the drastic fall-off of the 3.4.

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'88 GT- 3800 Turbo 11.367@121.03mph
gmtuners.com -Build info

Very good data to have. This is what is really needed for many other mods as well. Thank you very much for sharing.

I'll add this link up top, it may help with the data tha is incorrect.

http://captfiero.com/dynos grab the 2 xls files, they are huge, well huge for excel. 4mb for one of them, they have all the raw data including the AFR data.

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85GT Soon to be 87GT,93 Eldorado 4.9, 5spd Dual O2 Custom Chip, Custom Exhaust. MSD Everything Capt Fiero --- My Over View Cadero Pics Yellow 88GT 5spd Full Poly Suspension, Lowered 1/2" in front, Corner Carver.

Nice, I always love a good consistent comparison with lots of information included. Thanks.

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'10 Camaro LT/RS, 312hp V6 6-speed
'88 Fiero GT - coming soon! - Project MIDTRBO

The rest of my cars are for sale
There's no replacement for turbo placement

Interesting data. Just out of curiosity, did the engine with the Trueleo intake have any supporting mods, like a more aggressive camshaft, or head / LIM porting?

The engine long block on the engine with the Trueleo is bone stock with 100K miles on it taken from a pristine 86GT (now electric powered). I installed a new timing chain, and all new gaskets and seals, except the heads and bottom intake manifold have never been off. I had the injectors cleaned and flow balanced. The compression on all cylinders is between 155 and 165. The exhaust manifolds were welded up and ported. The TB is a FS Widebody. I also opened up the hole at the bottom of the air filter and put a staight pipe in instead of the water separator. The exhaust is stock with a Rodney Dickman high flow cat. The cat fell apart on the inside a few weeks before the dyno, so it is now hollow inside.

I have my eye on a parts car that has new FS headers in it. If I ever get a deal on the car, I will have headers for the 3.4 which I plan to build. I was thinking of new Trueleo headers, but by the time you ceramic coat them, they are in the $700-800 range. When I get my 3.4 built and I find a good home for my 2.8, then the 3.4 w/Trueleo intake will be put in my 87 t-top coupe and dyno'd after break in.
Jim

I just want to add, just in case this goes off in the wrong direction, I have seen the car twice. Jim don't BS. It really is what he says. Just really nice to see actual numbers.

Tony,
Thanks for the support. Great to see you and all the Spokane boys at Fierofest.
Jim

Thanks for the info.

Just a side not for any Southwest Canada or Northwest USA people our club has a dyno day scheduled for next month, we plan to get the dyno for the entire day. If anyone is interested in getting in on it, let me know the cost will be between 70 and 100 dollars for 3 pulls. We should have at least 1 V8, 1 3800SC, several 3.2's and 3.4's. May even get our local Turbo 4.9 and hopefully our local Turbo 383 guy if his car is finished in time.

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85GT Soon to be 87GT,93 Eldorado 4.9, 5spd Dual O2 Custom Chip, Custom Exhaust. MSD Everything Capt Fiero --- My Over View Cadero Pics Yellow 88GT 5spd Full Poly Suspension, Lowered 1/2" in front, Corner Carver.

I would like to see a compairson of a "Dawg" modified stock intake and a Truleo on a 3.4. I like the stock appearing engine but I would like to improve the flow.

I'll probably offer up the complete Dawg setup on my 88GT over to Brian with his 3.2 V6. I don't plan to dyno my 88GT as I plan to bring my 857 4.9. I don't belive there will be a before and after test, just an single test with it installed.

quote Originally posted by Rick 88: I would like to see a compairson of a "Dawg" modified stock intake and a Truleo on a 3.4. I like the stock appearing engine but I would like to improve the flow.

I`m really interested in seeing this as well for the same reasons. Thanks for posting this thread.

Nolan

[This message has been edited by Sourmug (edited 08-18-2010).]

Sorry guys due to lack of commitment from enough people. Our local club dyno day has been postponed.

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85GT Soon to be 87GT,93 Eldorado 4.9, 5spd Dual O2 Custom Chip, Custom Exhaust. MSD Everything Capt Fiero --- My Over View Cadero Pics Yellow 88GT 5spd Full Poly Suspension, Lowered 1/2" in front, Corner Carver.

bump

We never did a comparisopn between a Dawg and our intake though we did put a 3.4 on on the dyno with oursandn and a stcok intake. That was with our first intake. BTW it had lots of welds/seams back then.

I really can't recall if that engine had stock or aftermarket headers? It did rev really nice as the dyno sheet shows. With either setup, ours or the dual, the main thing to take note of is the available power at higher RPMs. Either intake design will take full advantage of a more aggressive cams and/or headers.

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trueleo.com
RSpiderII@aol.com

Thanks for posting that graph Francis, very easy to understand. Those are some impressive numbers!

by way of comparison, on a 2.8 with the carb and ported stock logs, the peak torque was about 140 with the peak hp at about 132. The 3.4 does have an advantage at all points.

Arn