Just got back from R&D Dyno trying to tune my turbo classic with an F-Max kit and S-3 cams.
I was only able to get 368 hp and 327 ft/lbs of torque @ 22 psi of boost. I am very dispointed because most of the F-Max cars I helped build or tune get anywhere from 395-410 wheel hp at this boost level and my set up is identical to my formula for a 400 WHP SR20DE with a couple of exceptions.
I usualy recomend a custom 3" downpipe and I usualy hand port the crap out of the turbine housing, then extrude hone it. My car is a straight up stock F-Max kit with a larger than stock front mount intercooler, 2.5" down pipe and stock unported turbo. I think I have too much backpressure which is hurting my peak power.
It really sucks that every turbo car I helped set up is significantly more powerful than mine! I have a 3" downpipe, Tial wastegate and a ported manifold and ported& extrude honed turbine housing sitting in the garage. I am gonna install these and see if my power will then fall in line with what its supposed to be.
On thing I noticed is that with the big FMIC, the power is really consistant, all of my runs were within 1 hp of each other.
I am supposed to be an expert at this stuff, too bad I suck.
I'm really sorry to hear that Mike, hopefully when you replace those parts you will increase your HP numbers, How is your timing? I'm sure you know timing is critical on turbo cars. Good luck on your quest for the missing HP.
PS when you hand port a turbo, do you use a dremel? What are the areas most concentrated on? I'm coming back for 15 days in November, I really need to get to work on my car. After I get done with my TG brake, I'll have 4 months left in Italy before I get back to my baby. My goal is simply to do it right this time .
I am supposed to be an expert at this stuff, too bad I suck
ROFLMAO. In whos eyes? Sure as hell not too many people in the community.
Mike you dont suck, you just put others first. Thats cool in my book. I guess that old saying in an automotive shop doesnt apply to you, at least I hope not. LOL j/k
"When you work on someone elses car, do is as if it were your own."
I'm sure youll get it to where you want it, and be cool enough to share your findings with us like always.(Like the large IC finding).
What I am really interested in is that "big" motor I have heard about. I'm sure all the other tech freaks like me are itching to hear whats going into it and why.
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Patrick Scott
Yeah, thats a roll cage in there.
I shall call him...Mini-Me
Thanks Mike!!!! Now i dont feel so bad with 321hp at 17psi.J.K.
But is porting a turbo really that essintial? I have a stage 5 with the turbine housing extrude honed. Should i port it? I am interested to see you results after you go back.
Thats still not to bad. 368hp
Just look at it this way, you have more hp than people that paid 3X's the price of your car.
I usualy recomend a custom 3" downpipe and I usualy hand port the crap out of the turbine housing, then extrude hone it. My car is a straight up stock F-Max kit with a larger than stock front mount intercooler, 2.5" down pipe and stock unported turbo. I think I have too much backpressure which is hurting my peak power.
It really sucks that every turbo car I helped set up is significantly more powerful than mine! I have a 3" downpipe, Tial wastegate and a ported manifold and ported& extrude honed turbine housing sitting in the garage. I am gonna install these and see if my power will then fall in line with what its supposed to be.
Well if you dynoed with a 2.5 exhaust also along with the 2.5 downpipe, there is allot of your hp lost right there. I went to 3 inch exhaust and gained loads of power on my t28 At your boost levels you'll definetely hit 400 + with the larger exhaust.
Originally posted by psshhgoesmysr20 I'm really sorry to hear that Mike, hopefully when you replace those parts you will increase your HP numbers, How is your timing? I'm sure you know timing is critical on turbo cars. Good luck on your quest for the missing HP.
PS when you hand port a turbo, do you use a dremel? What are the areas most concentrated on? I'm coming back for 15 days in November, I really need to get to work on my car. After I get done with my TG brake, I'll have 4 months left in Italy before I get back to my baby. My goal is simply to do it right this time .
I am running 26 degrees total timing accros the top of the powerband and about 23 degrees around the torque peak.
I use an air die grinder to port the housing. I take out all the bolt clearance bumps, smooth out where the wastegate port is and thin down the tounge area of the housing. I open it up to gasket size and basicaly keep the trapzoidal shape, just make it a litlle bigger.
When you are on leave, come on down if you have time, and I will show you where I port the housing.
Originally posted by Jackson Diamond Thanks Mike!!!! Now i dont feel so bad with 321hp at 17psi.J.K.
But is porting a turbo really that essintial? I have a stage 5 with the turbine housing extrude honed. Should i port it? I am interested to see you results after you go back.
Thats still not to bad. 368hp
Just look at it this way, you have more hp than people that paid 3X's the price of your car.
I found that extrude honing alone doesnt open up the housing the way I want it to be. I figure the only differences between my car and my firends are the 3" downpipe and the porting and extrude honing so I am hoping thats the main difference.
Originally posted by Slow 96R
Well if you dynoed with a 2.5 exhaust also along with the 2.5 downpipe, there is allot of your hp lost right there. I went to 3 inch exhaust and gained loads of power on my t28 At your boost levels you'll definetely hit 400 + with the larger exhaust.
My exhaust is 3" after the downpipe. I think the small downpipe in the area of the wastegate discharge port is hurting me a lot.
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