Forged Iron 370 / AFR 225's / Truck Manifolds / PT88 by 98Z28CobraKiller

By diyauto
( 2 )

3 minute(s) of a 128 minute read

3-26-2011

Having come from the NA and nitrous school of thought, I know how important getting the exhaust out is to building power. With my 408 and 350 shot, the car ran a 9.33. I had 2" primaries and true dual 3" exhaust. Then I get this turbo and I am look at this little T4 flange that all my exhaust is going thru and I'm thinking that there is no way that I will go faster if all my exhaust has to travel thru this one tiny little hole. I did go faster and easier but I know that there is a bunch left there. For all intent and purposes, it's free horsepower in terms of stress to the motor. Sort of like putting long tubes on an NA car with exh manifolds.

My next mod once it's breathing will be the 91mm front end.


6-27-2011

I'm running the old Flex-a-lite thin pushers with the straight blades and the standard size Griffin that everyone runs. Sorry, don't have the part#'s handy. I will say that apparently it's the WRONG combo because it is running way too hot IMO. I really need to address it. The car pretty much sits during the summer as it's WAY too hot here and rains almost every afternoon to be driving around without A/C.


7-29-2011

Nothing new. I have a temperature problem and maybe a bearing problem. It is so hot here this time of year that nobody is really racing so I haven't been too motivated to address any of the existing issues, much less redo the kit to accommodate the bigger exhaust housing.

I'm starting to miss it though. Car's been parked for like 4 months.


8-30-2011

Just a quick update. I dropped the motor and trans Sunday night and pulled the heads today and took them to the machine shop. I was really expecting to see a blown head gasket or 2. No such luck. There does seem to be a problem with one of the heads not having sealed properly to the head gasket. It is possible that from the last rebuild, my surface wasn't perfect as I didn't have them checked. The builder is going to mill the minimum to get them flat and I'll post up how much that ends up being.

With regards to the hot oil pressure, I think it has more to do with how hot it is getting because of the combustion leaking into the cooling system. At 210*F+ it drops to about 25psi at idle. Under WOT throttle it's 60+. Builder told me to leave. While the motor is out, I will be adding an Improved Performance bolt-in oil pan baffle. This is to resolve a completely unrelated issue of oil pressure loss that is common under hard acceleration due to the oilmoving away from the pickup off the line. If I find bearing material in the pan, then I'll dig in farther.

Next she is going to my fabricator friend to switch over to the new T6 1.00 A/R exhaust housing, move the IC up and forward a little, delete the hood latch bracket and install the Aerocatch hood latches. This should help get some more fresh air up to the radiator.


Standard ARP studs and stock 6.0 MLS gaskets. Going to be trying out the LS9 gaskets this go round.

On another note. The stock exhaust MLS gaskets with the copper spray didn't leak even a tiny bit of exhaust pressure upon removal inspection



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