Obliterating the CT27 horsepower record

ATSAaron · 12-20-2008, 01:18 PM

A couple years ago mr2by4 set the CT27 horsepower record at 320whp on RACE GAS at 20 psi. The biggest issue was the turbo's inability to hold higher boost. Originally blamed on the turbo itself, the problem actually was the stock internal wastegate. It's only a 7 psi gate. So asking it to hold over 20 psi even with a boost controller is basically impossible.

I've been testing some stuff on my own car (a GT3071 rom tune combo kit actually) and decided to try something out on the CT27. I went to the hardware store and bought myself a fairly sturdy spring to help increase the strength of the wastegate. Armed with a 1/8th drill bit and a cordless drill I made a fairly clean install of the new spring.

I also made a wastegate tester from an air compressor pressure regulator so that I had a rough idea what I was getting myself into. I measured the wastegate flapper movement/position at 9 psi, and increased the tension of the new spring until I got the same position at 14 psi.

Here's a quick pic:

So I strapped it down and made some pulls. First my 93T's mods list (it's not very long)

Zen BOV
Power FC
Walbro fuel pump
550's
ATS FPR (50 psi)
ATS Rail
Greddy PE exhaust
3" downpipe
ATS 3.5" intake with K&N filter
old CM stage 1 clutch (that probably would not hold up on a drag launch)
some 93 octane pump gas in the tank, but mostly C16 RACE GAS. I'd say about a 35% 93 octane and 65% C16

That's it. No cam gears, no cams, stock longblock, stock head gasket 130,000 miles.

So the new spring let me hold 1.7 bar (24.5 psi) pretty cleanly. And this is what I got:

RACE GAS (cuz I know someone is going to ask) Woo hoo. 350 wheel horsepower off of a bolt on CT27 turbo. You can tell I'm really putting the spurs to it to get that much power because the torque is dropping like a rock. Just FYI the ATS GT3071 out powered it by about 30 whp at this boost level.

See ya,

Aaron

jparker · 12-20-2008, 02:13 PM

Aaron you are the MAN!

im glad I know ya!

_Jim_ · 12-20-2008, 02:27 PM

We already knew this. Hux racing HAS DONE the same thing a few months back, testing the limits of the CT20b. Obviously CT20b and the CT27 being VERY similar, they produced the SAME results. Im happy to see that Hux's original testing was been retested and results have been very similar. What are you opinions about this helper spring and say 22psi on a stock GEN3 with CT20b on 93pump with water/meth injection.....safe?

Lachrymal Cloud · 12-20-2008, 06:27 PM

congrats, that's very impressive.

mr29180 · 12-20-2008, 07:42 PM

Nice !!!! I love knowin how much hp wer gettin I. Our turbo!!

ATSAaron · 12-20-2008, 08:43 PM

I went back tonight to get the GT3071 runs and couldn't resist trying some pulls on a cooler intercooler (yesterdays were pretty warm). I managed a 353 run!! I also checked and with the boost controller turned all the way down I can boost as little as .9 bar.

And just for comparison the ATS GT3071 at the same boost level (1.8 bar) (note: a problem was realized in the base timing AFTER this was dyno session, so I think I could have eeked a little more spool out of it. But honestly I wasn't trying to set any records with the 3071, really I just wanted an idea of how it would run on a stock internal car.

and the GT3071 on pump gas at 1.2 bar of boost:

Aaron

mr29180 · 12-20-2008, 09:19 PM

How about the ct26 do you know the max??just wonderin did some one did this max??

_Jim_ · 12-27-2008, 02:20 PM

any plans of throwing in bigger injectors and running even higher boost?

12-20-2008, 01:18 PM	#1 (permalink)
ATSAaron No Skills Join Date: Sep 2005 Posts: 200 Thanks: 8 Thanked 14 Times in 13 Posts iTrader Rating: (5/100% )	Obliterating the CT27 horsepower record A couple years ago mr2by4 set the CT27 horsepower record at 320whp on RACE GAS at 20 psi. The biggest issue was the turbo's inability to hold higher boost. Originally blamed on the turbo itself, the problem actually was the stock internal wastegate. It's only a 7 psi gate. So asking it to hold over 20 psi even with a boost controller is basically impossible. I've been testing some stuff on my own car (a GT3071 rom tune combo kit actually) and decided to try something out on the CT27. I went to the hardware store and bought myself a fairly sturdy spring to help increase the strength of the wastegate. Armed with a 1/8th drill bit and a cordless drill I made a fairly clean install of the new spring. I also made a wastegate tester from an air compressor pressure regulator so that I had a rough idea what I was getting myself into. I measured the wastegate flapper movement/position at 9 psi, and increased the tension of the new spring until I got the same position at 14 psi. Here's a quick pic: So I strapped it down and made some pulls. First my 93T's mods list (it's not very long) Zen BOV Power FC Walbro fuel pump 550's ATS FPR (50 psi) ATS Rail Greddy PE exhaust 3" downpipe ATS 3.5" intake with K&N filter old CM stage 1 clutch (that probably would not hold up on a drag launch) some 93 octane pump gas in the tank, but mostly C16 RACE GAS. I'd say about a 35% 93 octane and 65% C16 That's it. No cam gears, no cams, stock longblock, stock head gasket 130,000 miles. So the new spring let me hold 1.7 bar (24.5 psi) pretty cleanly. And this is what I got: RACE GAS (cuz I know someone is going to ask) Woo hoo. 350 wheel horsepower off of a bolt on CT27 turbo. You can tell I'm really putting the spurs to it to get that much power because the torque is dropping like a rock. Just FYI the ATS GT3071 out powered it by about 30 whp at this boost level. See ya, Aaron

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12-20-2008, 02:13 PM	#2 (permalink)
jparker No Skills Join Date: Dec 2008 Location: Norman, Oklahoma Posts: 11 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Aaron you are the MAN! im glad I know ya!

12-20-2008, 02:27 PM	#3 (permalink)
_Jim_ No Skills Join Date: Nov 2008 Posts: 32 Thanks: 1 Thanked 2 Times in 2 Posts iTrader Rating: (0/0% )	We already knew this. Hux racing HAS DONE the same thing a few months back, testing the limits of the CT20b. Obviously CT20b and the CT27 being VERY similar, they produced the SAME results. Im happy to see that Hux's original testing was been retested and results have been very similar. What are you opinions about this helper spring and say 22psi on a stock GEN3 with CT20b on 93pump with water/meth injection.....safe?

12-20-2008, 06:27 PM	#4 (permalink)
Lachrymal Cloud The Constellation Branch Join Date: Jun 2007 Location: Gilbert AZ Posts: 421 Thanks: 21 Thanked 5 Times in 5 Posts iTrader Rating: (2/100% )	congrats, that's very impressive.

12-20-2008, 07:42 PM	#5 (permalink)
mr29180 Cage fighter Join Date: Mar 2008 Location: Frisco (bay area) Posts: 1,050 Thanks: 5 Thanked 31 Times in 27 Posts iTrader Rating: (1/100% )	Nice !!!! I love knowin how much hp wer gettin I. Our turbo!!

12-20-2008, 08:43 PM	#6 (permalink)
ATSAaron No Skills Join Date: Sep 2005 Posts: 200 Thanks: 8 Thanked 14 Times in 13 Posts iTrader Rating: (5/100% )	I went back tonight to get the GT3071 runs and couldn't resist trying some pulls on a cooler intercooler (yesterdays were pretty warm). I managed a 353 run!! I also checked and with the boost controller turned all the way down I can boost as little as .9 bar. And just for comparison the ATS GT3071 at the same boost level (1.8 bar) (note: a problem was realized in the base timing AFTER this was dyno session, so I think I could have eeked a little more spool out of it. But honestly I wasn't trying to set any records with the 3071, really I just wanted an idea of how it would run on a stock internal car. and the GT3071 on pump gas at 1.2 bar of boost: Aaron

12-20-2008, 09:19 PM	#7 (permalink)
mr29180 Cage fighter Join Date: Mar 2008 Location: Frisco (bay area) Posts: 1,050 Thanks: 5 Thanked 31 Times in 27 Posts iTrader Rating: (1/100% )	How about the ct26 do you know the max??just wonderin did some one did this max??

12-27-2008, 02:20 PM	#8 (permalink)
_Jim_ No Skills Join Date: Nov 2008 Posts: 32 Thanks: 1 Thanked 2 Times in 2 Posts iTrader Rating: (0/0% )	any plans of throwing in bigger injectors and running even higher boost?