The Zombie rear mount turbo saga
11-29-2007, 11:55 PM
#24
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what do you do if you already have a 3" y pipe and piping. Just throw away that y pipe and install all 2.5 inch. It's already wrapped, but do have the long tubes. Should I try and wrap them???-
11-30-2007, 02:06 AM
#26
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Thanks for the write up. Your findings were the main source of info for my build from the beginning. The move to 3.5" to 4" downpipe is what I have in the works currently. Do you think its significant to have it shorter than 1.5"? Im using a 4" elbow which will be cut at an angle on the bend to give it a slightly larger opening than 4"
Also you tossed stock exhaust from manifolds all the way back? Isn't the stock y-pipe already 2.5"? I thought only the "over-axle" pipe was bigger than 2.5" at 2.75". And would you recommend a .96 housing over a .81 for a T67? I don't care about high end, just street spool. I figure .81 is a better deal but I always wonder if .96 would give better power throughout the rpm range.
Also you tossed stock exhaust from manifolds all the way back? Isn't the stock y-pipe already 2.5"? I thought only the "over-axle" pipe was bigger than 2.5" at 2.75". And would you recommend a .96 housing over a .81 for a T67? I don't care about high end, just street spool. I figure .81 is a better deal but I always wonder if .96 would give better power throughout the rpm range.
Last edited by JAvenger007; 11-30-2007 at 02:21 AM.
11-30-2007, 03:04 AM
#27
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Thanks for the write up. Your findings were the main source of info for my build from the beginning
11-30-2007, 03:10 AM
#28
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Good read, a++++, will buy again!!! lol ebay.
Jeremy that is a great saga, next time do an epic and add a little love story to it my mang. lol hollywood
Jeremy came by and he gave me a ride in his car on the 91 oct tune. This bad boy spools instantly and was spinning tires at 100mph, totally sick.
Jeremy that is a great saga, next time do an epic and add a little love story to it my mang. lol hollywood
Jeremy came by and he gave me a ride in his car on the 91 oct tune. This bad boy spools instantly and was spinning tires at 100mph, totally sick.
11-30-2007, 04:05 AM
#29
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wow, great write up. very intersting on the exhaust part also. my setup starts next week. stock ls1 ( 04 gto ), sts kit, TC76mps with .81 A/R, meth, fuel. i have a .96 a/r to go with it for later down the road when i do a cam or motor build.
about how much faster do you start spooling when you changed the exhuast setup after the turbo. i am looking for more streetable power and not concerned with as much top end. would you have any suggestions for my build.
about how much faster do you start spooling when you changed the exhuast setup after the turbo. i am looking for more streetable power and not concerned with as much top end. would you have any suggestions for my build.
11-30-2007, 10:30 AM
#30
Also you tossed stock exhaust from manifolds all the way back? Isn't the stock y-pipe already 2.5"? I thought only the "over-axle" pipe was bigger than 2.5" at 2.75". And would you recommend a .96 housing over a .81 for a T67? I don't care about high end, just street spool. I figure .81 is a better deal but I always wonder if .96 would give better power throughout the rpm range.
I don't know if it spooled at an earlier RPM range or not, but it spooled way faster time wise. With an automatic it's not possible to measure spool by RPM because of converter slip.
11-30-2007, 04:37 PM
#31
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Yes, the stock exhaust is completely gone except for manifolds. The reason is because I needed ground clearance and the stock y-pipe was scraping on every speed bump. My car is very low in the front because of all the extra weight. I need new stiffer springs. The new y-pipe is higher and still hits on every speed bump tearing up my header wrap even though it is at least 1" higher than the stock y-pipe.
Changing the exhaust after the turbo isn't going to get huge gains for most like it did for me. My turbo uses a 3.5" v-band and was going into a 3" exhaust. My 3" exhaust butted right up against the v-band and we think it was causing a lot of turbulence hindering the exhaust exiting. A very easy way to check is to just pull your after turbo exhaust off. The difference in my car was huge, but I doubt others will see this kind of gain unless they have the same problem.
I don't know if it spooled at an earlier RPM range or not, but it spooled way faster time wise. With an automatic it's not possible to measure spool by RPM because of converter slip.
Changing the exhaust after the turbo isn't going to get huge gains for most like it did for me. My turbo uses a 3.5" v-band and was going into a 3" exhaust. My 3" exhaust butted right up against the v-band and we think it was causing a lot of turbulence hindering the exhaust exiting. A very easy way to check is to just pull your after turbo exhaust off. The difference in my car was huge, but I doubt others will see this kind of gain unless they have the same problem.
I don't know if it spooled at an earlier RPM range or not, but it spooled way faster time wise. With an automatic it's not possible to measure spool by RPM because of converter slip.
thanks. i will keep that in mind when he system goes on next week.
12-19-2007, 11:20 PM
#33
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yes, the best method is shorty headers , coated and wrapped. He would have gone that way, but he was too cheap. The manifolds are off my car and I have stepped long tubes on my car. My long tubes are wrapped, and it isnt a problem. Ideally, shorty headers, coated, y pipe (3 inch is fine) coated and wrapped, and a coated exhuast housing.
Ps I built zombies car......but it has been a sage. Benneliwangs car, is a twin rear mount with coated wrapped shorties, coated duals (vette) to twins.
Ps I built zombies car......but it has been a sage. Benneliwangs car, is a twin rear mount with coated wrapped shorties, coated duals (vette) to twins.
12-20-2007, 09:20 AM
#36
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Ill shoot some pics of the twined vette (its on one of the lifts) and the henry. Pm me with an email and Ill send them. The henry J is probably the coolest thing around my shop, and its surrounded by turbo cars of all natures. Most people dont even realize what was done or how it was done.
The henry j 's build sheet would read
turboed,intercooled, 4wh discs, independant front and rear, power steering, tilt, ac, cruise, abs, air bags, 5 speed, 2400 lbs, power windows, 19 inch wheels and its a 1954. Its all srt 4 neon underneath. Dash, steering, suspension, seats everything. I just need to get to painting it, so I can set the glass in. As car builds go, it has been pretty easy, just a different approach.
What were we talking about? Oh yea, zombies red camaro, I have to do the cage in it soon, and a couple other small things so it will go 9's in jan/feb. That car just proves you dont need a lot of "high" end stuff to make the power or go fast. It even got used pistons that a "shop" told their customer were no good. He just got yet another engine. The only new parts in Zombies entire engine were the rings/bearings, the rods, the oil pump, gaskets and the head studs and valve springs and the thing is making close to 900 at the crank? My coments to Zombie from the begining were , buicks just prove turbos overcome all.
The henry j 's build sheet would read
turboed,intercooled, 4wh discs, independant front and rear, power steering, tilt, ac, cruise, abs, air bags, 5 speed, 2400 lbs, power windows, 19 inch wheels and its a 1954. Its all srt 4 neon underneath. Dash, steering, suspension, seats everything. I just need to get to painting it, so I can set the glass in. As car builds go, it has been pretty easy, just a different approach.
What were we talking about? Oh yea, zombies red camaro, I have to do the cage in it soon, and a couple other small things so it will go 9's in jan/feb. That car just proves you dont need a lot of "high" end stuff to make the power or go fast. It even got used pistons that a "shop" told their customer were no good. He just got yet another engine. The only new parts in Zombies entire engine were the rings/bearings, the rods, the oil pump, gaskets and the head studs and valve springs and the thing is making close to 900 at the crank? My coments to Zombie from the begining were , buicks just prove turbos overcome all.
12-20-2007, 11:32 AM
#38
I think 1320 is correct that properly setup shorty headers could show some improvement, I'm not changing what is working great on my setup though. I'm cheap
researching what buick guys have done and what they have made work definately helped. They are the mad scientists of turbo cars. They have tried just about everything you can think of.
12-20-2007, 11:43 AM
#39
I'm keeping the stock returnless system on the new injectors too if I can get it to idle well (I think I can). I don't see the need to improve it and convert to external FPR setup. I'll change it if it becomes a problem.
12-21-2007, 09:30 AM
#40
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Mike, isn't your after-turbo exhaust like mine? 10" of 3"OD fencepost?
Not much there to alter.
Zombie, I wanted to say thanks, in addition to the others, for a very well-written, thought-out, and informative post. One of the things we see a lot of is hiding recipes for success in order to gain some kind of competitive advantage on the street. It's refreshing to see the old-fashioned thought of sharing ideas to further the cause of going fast. I know many of us with STS, etc, have been banging our collective heads against the wall trying to get a reasonably-spooled combo that doesn't fall flat at 5700 or so.
Like BFE, I have an 04 GTO. I wrapped my exhaust and saw a great flattening out of power curves, versus the incredibly hard smack at 3800rpm. Gobs of dyno HP makes no difference if you only have it from 4k-6k. I'm now spooling shortly after 3200 with a 76GTS .96A/R.
I will be changing up my exhaust to 2.5 all the way back, eliminating the factory driver side 2" crossover we have on the GTO's going into the single that runs to the turbo. I was also considering LT's, but I am glad to see Factual proof that it will do no good over ported stockers or shorties.
Again, thanks. I know a lot of cars will benefit from your generosity.
Happy Holidays!
-Ronnie
Not much there to alter.
Zombie, I wanted to say thanks, in addition to the others, for a very well-written, thought-out, and informative post. One of the things we see a lot of is hiding recipes for success in order to gain some kind of competitive advantage on the street. It's refreshing to see the old-fashioned thought of sharing ideas to further the cause of going fast. I know many of us with STS, etc, have been banging our collective heads against the wall trying to get a reasonably-spooled combo that doesn't fall flat at 5700 or so.
Like BFE, I have an 04 GTO. I wrapped my exhaust and saw a great flattening out of power curves, versus the incredibly hard smack at 3800rpm. Gobs of dyno HP makes no difference if you only have it from 4k-6k. I'm now spooling shortly after 3200 with a 76GTS .96A/R.
I will be changing up my exhaust to 2.5 all the way back, eliminating the factory driver side 2" crossover we have on the GTO's going into the single that runs to the turbo. I was also considering LT's, but I am glad to see Factual proof that it will do no good over ported stockers or shorties.
Again, thanks. I know a lot of cars will benefit from your generosity.
Happy Holidays!
-Ronnie