I finally got back to the dyno with my turbo 3.4l DOHC car. I put down 415 WHP on pump gas. This is the same setup I have been driving for awhile now without any special prep. Boost is ~13.5 psi. Needless to say, I am ecstatic about the numbers. Now I just need that 11s time slip and I can live a peaceful happy life! I will scan the dyno plot and post it up soon.
------------------ 62 Buick Special 86 GT, 5-Speed 87 GT, 3.4l DOHC Turbo 389 HP @ wheels 88 Toyota Supra Turbo
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11:40 PM
PFF
System Bot
Matt Hawkins Member
Posts: 586 From: Waterford, MI Registered: Oct 2000
yeah... what is done to the engine? what trans? turbo? etc...? I was going to turbo my DOHC but didnt want to worry about the isuzu trans grenadeing. Actualy had everything i needed to turbo the engine but got scared by a few members here and on RFT so i just sold it all and bought and RX7 and did a V8 swap...
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12:26 AM
Australian Member
Posts: 4701 From: Sydney Australia Registered: Sep 2004
Awesome numbers!! Can you post a video of the car running? I would like to hear how it sounds with the turbo as I am putting together my turbo and can't wait to hear it.
87 Fiero GT 5sp with Vortec L35 4300 Turbocharged V6 Bully Stage 2 clutch Syclone intake manifold and engine management with Moates adapter and chip burner Air/water intercooler and Devil's Own progressive water/alky injection 50lb injectors, 3 bar map sensor, Walboro fuel pump and Jabasco Intercooler pump LM1 wideband on custom manifolds and 3" stainless exhaust system T31/T04B S4 turbo with a Super T61 in the box S10 caliper conversion. Murphy's Constant Matter will be damaged in direct proportion to its value Murphy's Law of Thermodynamics Things get worse under pressure. Arthur C. Clarke "Any significantly advanced technology is indistinguishable from magic"
Matt- do you have a build thread or can you post the list of modifications you have done to produce those incredible # 's. I just picked up a DOHC yesterday and will be turbo-ing it next year. But I think 350WHP is more than enough for me!
Mike
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08:59 PM
jstricker Member
Posts: 12956 From: Russell, KS USA Registered: Apr 2002
Some have asked and this is the quick run down of what the car has done to it.
3.4l DOHC V6 from 1995 Monte Carlo Ported/polished combustion chambers; good bolts in bottom end; hypereutectic pistons; custom intake manifold; 38 lb/hr injectors; Haltech E6K ECU; custom tubular stainless headers and crossover; GT3071r turbo; Tial 38mm wastegate; Fidenza Al flywheel; Clutchnet six puck sprung hub clutch with stock pressure plate; large Ebay intercooler core with custom end tanks/draw fans mounted under car; I spin the engine to 7k with a 7200 rev limiter.
12.5" front discs from 2000 F-car; 4-piston fixed calipers; 11.25" rear disc with 2000 F-car rear calipers; front and rear lowered ~3/4"; 17x7 front rims with 235/40; 17x8 rear rims with 255/40
I will try to post up some videos. I didn't have my camera at the dyno, but I have a couple videos from the track.
------------------ 62 Buick Special 86 GT, 5-Speed 87 GT, 3.4l DOHC Turbo 415 HP @ wheels 88 Toyota Supra Turbo
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10:33 PM
crzyone Member
Posts: 3571 From: Alberta, Canada Registered: Dec 2000
Wow, that is awesome. I hope it holds up for you. Amazing what can happen when you get everything propperly sized for a motor. This turbo is much nicer than the setup I remember you having.
Good job man, look forward to the dyno graph.
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10:59 PM
ryan.hess Member
Posts: 20784 From: Orlando, FL Registered: Dec 2002
Originally posted by jstricker: These are great numbers but, remember, this install is the EXCEPTION and not the rule, and highly modified (turbo) at that.
If you guys like the V6's/4's great for you, have at it. I like them all.
I like (love?) anything with over 300whp! And I would say this is almost a rule... Out of the top 10 cars on the 1/4 mile fiero list that are not using nitrous, 9 of them are V6's.
I drive a V8, but Matt put down 160whp more than I did. That's like an extra engine crammed under the front compartment. Stock 2.8 puts down what, 130whp? That's crazy!
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11:41 PM
Aug 13th, 2007
Formula88 Member
Posts: 53788 From: Raleigh NC Registered: Jan 2001
dang matt your way over by detroit, im going to be puting my 3.4 dohc in some time soon, woulda loved to see yours in person, how was the swap over all? hard? what kinda mounts did you use.
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03:16 AM
Matt Hawkins Member
Posts: 586 From: Waterford, MI Registered: Oct 2000
dang matt your way over by detroit, im going to be puting my 3.4 dohc in some time soon, woulda loved to see yours in person, how was the swap over all? hard? what kinda mounts did you use.
The only stock mount I used was the one under the crank pulley. I made new mounts for the trans and have extra heim joint mounts on both sides of the engine over on the accessory side. I made a dog bone mount that it attached to the transmission bolt and mounts to a reinforce point on the trunk side. Since I was making these, I tilted the engine towards the back sligthly so I can get the spark plug wires out with the decklid on the car.
[This message has been edited by Matt Hawkins (edited 08-13-2007).]
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10:09 AM
Pyrthian Member
Posts: 29569 From: Detroit, MI Registered: Jul 2002
Good tuning saves a lot of parts. The only engine related failure I have had was a head gasket. It was leaking the slightest amount of combustion gas into the cooling system. I drove it for several thousand miles like that and pulled it out during the winter to replace. I have had the turbo on the engine for 5 years now. I average about 12k miles a year on the car.
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01:44 PM
Alex4mula Member
Posts: 7403 From: Canton, MI US Registered: Dec 1999
That is great! I have seen this car (long time ago) and I think it is a true sleeper. Would love to see it at the track again. Now what you need to tell people here is how much time have you spent tuning it to get there. Many think thay can slap some parts and get 400rwhp with a V6 or even a V8. Not true. Anyone show me how many proven 400rwhp cars we have here?? I can remember probably four.
I haven't tuned the car much in over a year. The past two years have been about the same. But, it has come a long way. I dyno'd at 282 WHP four years ago. That was with my old T3/T4 hybrid turbo. I have since changed the turbo to a GT3071r and have adjusted the cam timing. Even though the 3.4l DOHC could rev to 7k from the factory, the power peak was at 5200 RPM. I adjusted my cam timing to move the power peak up to ~6700 RPM. That gives me a little less torque, but more useable HP range. I am making over 300 WHP from 4300 to 7200 RPM. It is very linear and feels like a NA engine.
I would say that I had two full years of tuning to get driveability and everything sorted. Tuning for power is the easy part. Making it work in all conditions takes much more time. I went slow being conservative because parts aren't cheap. And neither is my time. I have countless hours invested and don't want to waste them because I was in a hurry. The reason most people blow up turbo engines is greed. They aren't happy with the power and think that turning up the boost is the answer. I made 282 WHP at 13.5 psi and 415 WHP with the same 13.5 psi. Tuning makes all the difference in the world. I use only pump gas too and have driven it all over the country.
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02:02 PM
Matt Hawkins Member
Posts: 586 From: Waterford, MI Registered: Oct 2000
Agreed. I think all modified Fieros are cool. I have even done a TPI V8 swap before. Heck, I have wanted to do a Northstar swap with a turbo. The V8 vs V6 vs whatever will always rage on, but it should be done in good spirit. And watch out for those V8s, they have quite a bit of potential.
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02:06 PM
Matt Hawkins Member
Posts: 586 From: Waterford, MI Registered: Oct 2000
Video's work like a charm... she really gets up and goes haha!
Matt, could you go into more detail about the tuning, as per how the E6K is setup for you as well as other necessaries such as Injectors, fuel pump, AFPR etc.
Thanks man!
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04:13 PM
ryan.hess Member
Posts: 20784 From: Orlando, FL Registered: Dec 2002
They're all doing the same thing, compensating for limited volumetric naturally aspirated capability (in one way or the other).
John Stricker
Oh, BTW, I'm rapidly getting to the point that 1/4 mile times mean nothing to me. They represent and UNBALANCED CAR. If you want to build one, or anyone else does, and enjoys the sport, cool. Have at it. More power to you. I prefer something more complete.
quote
Originally posted by ryan.hess:
I like (love?) anything with over 300whp! And I would say this is almost a rule... Out of the top 10 cars on the 1/4 mile fiero list that are not using nitrous, 9 of them are V6's.
I drive a V8, but Matt put down 160whp more than I did. That's like an extra engine crammed under the front compartment. Stock 2.8 puts down what, 130whp? That's crazy!
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08:38 PM
ryan.hess Member
Posts: 20784 From: Orlando, FL Registered: Dec 2002
Originally posted by jstricker: If a turbo and blower count, why not nitrous?
That's a topic for another debate, but basically because $500 and a couple hours of labor later, I could have a 500whp fiero. I (personally) feel it is a cop out. Knowing that Matt put hundreds of man hours and thousands of dollars into his turbo 3.4 makes it that much more impressive than a $500 1 hour nitrous install.
That said, if you want a cheap performer, a 4.9L with a 200 shot of nitrous would get you there.
quote
Originally posted by jstricker: Oh, BTW, I'm rapidly getting to the point that 1/4 mile times mean nothing to me. They represent and UNBALANCED CAR. If you want to build one, or anyone else does, and enjoys the sport, cool. Have at it. More power to you. I prefer something more complete.
I agree that it can be an unbalanced car. A lot of fast cars on the 1/4 mile track can't even be driven on the street. However, the McLaren F1 does a 0-60 in 3 seconds, the 1/4 in 11... and I think we can all agree it is made for performance handling, not the 1/4 mile strip.
[This message has been edited by ryan.hess (edited 08-13-2007).]
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08:47 PM
fieroluv Member
Posts: 1951 From: Ft Wayne, IN USA Registered: Jul 2002
I have a different reason... with turbo or SC the added power is always there. You could hold the hammer down for a solid half hour and not run out of power. With nitrous you are just limited to how much juice you have in that 10LB bottle. You run out of juice you have to try and find someone to fill it back up for you. In the mean time if you have boost you just need to step on it again.
oh I know you can run out of gas, but I bet I can get gas before you can fill up that bottle. Especially if its midnight.
