SleeperRed90TGp Posted November 8, 2004 Report Share Posted November 8, 2004 Already have 2 1/2 back to the Y, high flow cat and stock mufflers. Jud Quote Link to comment Share on other sites More sharing options...
gp90se Posted November 8, 2004 Report Share Posted November 8, 2004 the faster you can get the exhaust out the better, I say go for it. Quote Link to comment Share on other sites More sharing options...
Guest TurboSedan Posted November 8, 2004 Report Share Posted November 8, 2004 Already have 2 1/2 back to the Y, high flow cat and stock mufflers. Jud i'd think you'd see more of a benefit than others since you have a bigger turbine, but on a stock TGP turbo the .68 A/R turbine is probably more of an issue/bottle neck. Quote Link to comment Share on other sites More sharing options...
Marcus18 Posted November 9, 2004 Report Share Posted November 9, 2004 faster spoolup. I've unhooked it before where the cat was and it spooled alittle faster. loud loud loud. Quote Link to comment Share on other sites More sharing options...
no1kicker Posted November 9, 2004 Report Share Posted November 9, 2004 Yeah if taking the cat off helps, a cutout will too. Quote Link to comment Share on other sites More sharing options...
dbtk2 Posted November 9, 2004 Report Share Posted November 9, 2004 I have no cat and magnaflow mufflers, but I'm still considering putting a cutout before where the cat used to be because I think it will help spool-up (not that I need it being fully spooled at 1800rpm already) and topend a little. I know when I took the exhaust off the TGP Coupe completely it hauled ass, so I would definateley try it. It should especially help with the bigger turbo. Not only that, but these cars sound really good with no exhaust on them IMO. Shawn Quote Link to comment Share on other sites More sharing options...
90moddedtgp Posted November 9, 2004 Report Share Posted November 9, 2004 i think it would help. I also agree the tgp's sound good with no exhaust Quote Link to comment Share on other sites More sharing options...
GutlessSupreme Posted November 9, 2004 Report Share Posted November 9, 2004 i think it would help. I also agree the tgp's sound good with no exhaust I can also concur with that Quote Link to comment Share on other sites More sharing options...
dkorinko Posted November 9, 2004 Report Share Posted November 9, 2004 I had a "cut out" if you wanna call it that, the exhaust was chopped well before the cat and then i just welded some piping on so that the exhaust would exit out the side of the car and not right under it. I really liked the sound, its cool when you let off the gas and u can hear the turbo wind down. And under full throttle acceleration.....I think you can imagine what that would sound like lol. I would say do it for sure! Quote Link to comment Share on other sites More sharing options...
Marcus18 Posted November 10, 2004 Report Share Posted November 10, 2004 My favorite sound is running it up to redline in 2nd and let off and let it engine brake......awesome it sounds like a semi jake brake. Quote Link to comment Share on other sites More sharing options...
90TGP Posted November 10, 2004 Report Share Posted November 10, 2004 Are cutouts legal at tracks that require street cars to have mufflers? Quote Link to comment Share on other sites More sharing options...
SleeperRed90TGp Posted November 12, 2004 Author Report Share Posted November 12, 2004 Well one thing I can tell is most of you guys like the sound of open exhust on a TGP. I'll wait and see. Thanks for the input. From what you all say it shouldn't hurt performance. Quicker spooling I don’t really want. I am trying now to get the boost down on launch. Got the cutout yesterday. Don't know If I will get it on by Sunday (track day)which might be a good thing. Run without and get a base line and run again with it if I get a chance this year and we will all know what difference it makes. Got the walbro pump so I have to get that in before I run. Damn I hate puting a pump in. Of course the warrenty expired on the old one. Only 2 years old and 5k miles, But I have to admit it pumped alot of gas. As for using a cut out at the track. Maybe in strictly stock you can't but for our cars there is no stock class. NHRA never got the blueprints for our motors so there in a modified class along with the hot rods. Jud Quote Link to comment Share on other sites More sharing options...
Guest TurboSedan Posted November 12, 2004 Report Share Posted November 12, 2004 have you guys seen that cut-out from ATP? i think they call it thier Virtual Exhaust System: http://atpturbo.com/root/releases/release091004.htm it's a boost activated exhaust cutout. you can even use a manual boost controller like a grainger valve to control when it opens or keep it from opening at all. cool! Quote Link to comment Share on other sites More sharing options...
TGPilot Posted November 12, 2004 Report Share Posted November 12, 2004 Where did you find that Josh? That is pretty cool! :shock: Wonder what the emissons station would say about it here in Colorado? Quote Link to comment Share on other sites More sharing options...
Guest TurboSedan Posted November 12, 2004 Report Share Posted November 12, 2004 Where did you find that Josh? That is pretty cool! :shock: Wonder what the emissons station would say about it here in Colorado? my brother found it while browsing the ATP website last night. could the emission station say anything about it? you could simply say it's used for off road/track use only. i'm not sure...here in WY there is no emission testing at all. Quote Link to comment Share on other sites More sharing options...
Jcrow Posted November 12, 2004 Report Share Posted November 12, 2004 I like that! i'm going to make one. It can exhaust in front of the front tires! Quote Link to comment Share on other sites More sharing options...
Marcus18 Posted November 12, 2004 Report Share Posted November 12, 2004 another would be going off the exhuast back pressure. when it gets to 20psi of where ever it would make a difference have a MBC open and releave it(then it wouldn't open till the rpms/flow gets high enough. it would scare people in a race when your sounding quiet then get loud at 4000rpm or whenever back pressure builds. marcus Quote Link to comment Share on other sites More sharing options...
Jcrow Posted November 12, 2004 Report Share Posted November 12, 2004 http://www.jcwhitney.com/autoparts/ProductDisplay/s-10101/p-518/c-10101 $40 and attach an extra wastegate actuator to it. Quote Link to comment Share on other sites More sharing options...
SleeperRed90TGp Posted November 13, 2004 Author Report Share Posted November 13, 2004 Yea that vacuum one would be nice. I discarded that and the motor driven cutouts, 1 to expensive and 2 Possible problems down the road 3 It comes out at 90*. Mine was 27 and I got a piece of shit. (summit P/N sum g4821) The hole for the outlet was not cutout to the size of the outlet pipe. Not even close. If you want a 2" outlet than thats about what I got. One end of the main pipe is necked down to 2 1/4 so it would have to be cutoff before installation. Maybe you get what you pay for but I could have made one by accident better than this. It's going back. Jud Quote Link to comment Share on other sites More sharing options...
Jeff M Posted November 13, 2004 Report Share Posted November 13, 2004 another would be going off the exhuast back pressure.when it gets to 20psi of where ever it would make a difference have a MBC open and releave it(then it wouldn't open till the rpms/flow gets high enough. it would scare people in a race when your sounding quiet then get loud at 4000rpm or whenever back pressure builds. marcus Its funny but your thinking is very inventive and what is lacking too often when overly confident book-smart engineers design things. I have thought about it this way, when the intake boost achieves your setpoint of lets say 10-12 psi, any excess exhaust prior to the turbo is vented into the downpipe allowing a sort of control balance of intake boost setting to exhaust backpressure settings/relieving. I did a test like this on a TGP and it did work, I was still able to achieve boost ramp up and the intake boost settings I wanted while venting off backpressure prior to the turbo. This is similar to a wastegate but goes beyond that in managing exhaust backpressure problems, this venting of BP and the wastegate do have some similar effects but are not totally the same in practice, i.e. real world applications. And yes it was faster, especially at higher rpms . Jeff M Quote Link to comment Share on other sites More sharing options...
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