Mirage Turbo/Colt GT

this is what i posted on gadsm.org. i am killercolt on that site. i visit this site often but i don't post much. here is the link. http://gadsm.org/showthread.php?p=631456#post631456



i finally got what i want out of a 4g63t.

533hp and 385tq @ 20psi on E85.

-2.0l
-wiseco 11:1 pistons
-eagle rods
-clevite bearings
-self ported and polished head and machined by classic machine shop
-machined by classic machine shop in cartersville and self assembled
-crower stage 3 cams
-1mm oversized intake and exhaust valves from chinabay
-aem and self tuned but definitely can benefit from better tune by an experienced tuner
-forrester intake (runner might be too short and big which could hurt torque)
-pte 1000cc injector
-single walbro fuel pump (wimpy. ran out of fuel pressure at 7500rpm)
-an-6 fuel line (might be too wimpy)
-chinabay 38mm wastegate
-gt35r (not hta)
-self built equal length ram horn turbo manifold
-3" exhaust
-chinabay 12 x 32 x 3" intercooler and piping kit
-chinabay tial knock off bov
-top secret blue printing.


e85=wow. i have to say that E85 is the bomb. there is no need for c16 for me any more. i got my for 2.20/gallon. i believer c16 is 9 bux now. i hope more people will start asking for it so we can have more pump around town. engine temperature never went over 175 degree on the dyno with a small fan in front of the car. i use to get 200+ degree after a pull. the fuel burn super clean. i pulled my spark plugs and they looks super clean with no carbon build up. i did not get a hint of knock voltage with this fuel. the draw back is it takes alittle more to make the same power as gasoline.

power was still going up but i had to stop at 7500rpm because fuel pressure was dropping. i was hoping for 550hp and 450 torque at 20psi. i wanted to turn the motor to 9000rpm and maybe even 10000rpm but it was leaning after 7500. i think i might be able to meet my goal with a little more tuning but i call it quit because it was getting too late.

i was not able to use my stroker kit/hta substitute aka 75 shot of nitrous because of the fuel pressure drop. i will be looking for a higher volume fuel setup for later. maybe a borsch 044 with a -8 feed line will be sufficient. in the meantime, i am pretty happy with the result.

what the hell are u running 11:1 for with a turbo that big at 20psi? wont last long.. will blow the head right off the motor.. or go thru head gaskets like crazy.






Steve <<<< is a sad panda after reading this post lol

Yeah Steve, alcohol changes things a little bit. You can get away with much higher compression.

Those are awesome #'s, dr. I too am planning to switch to E85 soon. Out by me C16 is almost $12 a gallon. The only thing that sucks is there are only 2 stations in my county that sell E85. I run the Forrester intake as well, and I can definitely attest to it killing low-end torque. It's real nice on the top-end though. I'm surprised you're not running out of injector at those power levels.

it is funny my old screen name on gadsm.org is slowdsm until the whole server crash. it is still slowdsm on importatlanta.com. i think about registering on here as killercolt.


slowdsm, e85 let you get away with a lot of thing. rhys runs 14:1 on his car with e85. i have heard of 15:1 boosted on e85. 11:1 is actually too conservative. i think 12:1 is actually ideal for the street just in case you have to turn the boost down and run 89-93 octane pump gas until you get more e85. also with 12:1, you don't have to worry to much about clearances between the piston, valves, and spark plug. with a good tuning system, you don't have to run some rediculous boost to make nice horse power. traditional journal bearings and 360 degree bearing turbo are useful again because you not going to kill it because of the lower boost level.

the key to making power is to have an air/fuel mixture that is as dense as possible to create a combustion with the highest potential energy. people like low compression piston so they can have more control over ignition timing and boost to create more power. the draw back to low compression is you have to run more boost to make more power which. boost level above 25psi on a standard bearing will wear out the thrust bearing in the turbo pretty fast. at 30psi and above on a standard bearing turbo, you can expect a turbo rebuild pretty soon. at high boost on a low compression motor, you sill have to run race fuel or a fuel with a high octane value because the air/density is as high as a high compression motor/low boost setup.

the other draw back to low compression is off boost torque and horse power suffered because of the lower density of air and fuel mixture.

high compression used to be a problem when high octane fuel is not available and there is no good way to control ignition timing. now day, there is no reason to use compression below 10:1 if you have the right tuning system.

my car already seen 500+ miles. the first 450 was on 87 octane on 16psi. yes 87 octane! i was breaking in the car when 87 octane was the only thing available in my area because of the gas crisis.

i understand all that. its just ive been dealing with turbo cars since 03 and everything I have read/heard is that people up to 8:3 or :5 or even up to 9:1.. u are the very first I have sen/heard of running over 9:1 comp. so it was a shock to me when I seen it was turbo.. cause 11 and up on a NA is good...



so there is no clearance issues running that setup? I would think since there stock 7.8:1 that going to 11 the valves would touch?


so with the 35r ur only running 20psi cause of the higher comp? with the 11 comp is it capable of the normal 30-40 psi that the turbo is normal ran at?

this is all very interesting.. I might have to build a new motor next season lol... thanks for the insight and info.


Steve <<< no more sad panda

You'd be surprised how many people are running 10:1+ compression on 2.0's and strokers. It's becoming really common. I'm pretty sure Shep was running 12.5:1 on his race car, and Brent Rau is up there as well. On meth or alcohol the ballgame changes a lot.

With that said, I had a buddy running 11:1 flat-top pistons in his built 2.4 on 91 octane pump gas. He ran this setup at 18psi all day long and never had a lick of knock, and that's on 91 octane. It just worked. Something about the quench area on the flat-top piston helping with combustion. All that crap about needing super low compression for turbo's is pretty old-school thinking if you ask me. Sort of like how you supposedly can't run HUGE cams with a turbo car because of the extra overlap--that's not necessarily true either.

nice.. see even I learn new things each day lol...just hate to read about it..



someone needs to make a program to put text into a video lol...

i won't be suprise to see shepard or rau running 15:1.

The only E85 station near me is a hour away

get 4 5 gallons tank and start driving down there to get some. e85 makes a good turbo great. i will be exploring the potential of the big 16g with and high compression in the near future. i think a 13:1 pistons engine, with a big 16g, 1g rods, e85, and 25psi will make 500hp with no problem.

Well done Thoai! Ricky told me you made over 500 and I wasn't surprised. I thought you'd be closer to 600, but I guess your fuel system wouldn't let you. Let me know when you're ready to start testing the 16g setup so we trade my E316g for your 35r! haha!