Marc's 1990 4.2L V8 Twin Turbo Coupe Quattro

my2000apb · Post by **my2000apb** » Sun Jul 12, 2009 9:49 pm

whats it making boost wise now? ~12?

still jstu stacked gaskets?

Post by **Marc** » Sun Jul 12, 2009 10:01 pm

on the 3.6, about 22psi. I havent turned the wick up on the 4.2 yet.

stacked gaskets, stock motor.

my2000apb · Post by **my2000apb** » Sun Jul 12, 2009 10:05 pm

ok ill see you in a month running 35 psi and a 4.3L 8200 rpm redline 800 whp coupe?

maybe with a parachute haha i kid, but really how far do you plan to take it?

Post by **Marc** » Sun Jul 12, 2009 10:12 pm

these turbos will probably only take me to mid 500whp, next up will be dual 2871's I think at which point I should be really pushing what the engine can take with stock internals. I dont mind blowing it up, so we'll see.

my2000apb · Post by **my2000apb** » Sun Jul 12, 2009 10:16 pm

k24's on there now? yeah id liek to see real life limits of a v8tt

death 4kqt · Post by **death 4kqt** » Mon Jul 13, 2009 5:16 am

marc, if chris achillies and I come down to get our cars tuned on the 25th...can we find time for a ride in the coupe? please :-D

Post by **Marc** » Wed Jul 15, 2009 8:26 pm

mechanicals and cosmetics are pretty much done. car just really needs a bath at this point (been sitting for almost 8 months!)

my2000apb · Post by **my2000apb** » Wed Jul 15, 2009 8:33 pm

got any nice overhead high def engine bay shots?

Post by **Marc** » Wed Jul 15, 2009 8:35 pm

my2000apb wrote:got any nice overhead high def engine bay shots?

car needs a bath first. I'll take some shots tomorrow.

a_CQ · Post by **a_CQ** » Wed Jul 15, 2009 8:43 pm

Sweet!! Motivational stuff right there...

Derracuda · Post by **Derracuda** » Wed Jul 15, 2009 9:02 pm

i lub your car Marc. thanks for making me feel compelled to build crazy stuff too (i might as well blame you since i started way back when you had the 4kqt and powdercoated anything that would unbolt

)

my2000apb · Post by **my2000apb** » Wed Jul 15, 2009 9:04 pm

a4kquattro wrote:
my2000apb wrote:got any nice overhead high def engine bay shots?

car needs a bath first. I'll take some shots tomorrow.

:woowoo: :thanks:

RSCoupe · Post by **RSCoupe** » Thu Jul 16, 2009 4:12 am

Glad to see that you're working on the car instead of cleaning the garage. :wink:

Post by **Marc** » Thu Jul 16, 2009 4:30 am

RSCoupe wrote:Glad to see that you're working on the car instead of cleaning the garage. :wink:

haha, you should have seen it *before* I put the coupe in the garage!

scottmandu · Post by **scottmandu** » Thu Jul 16, 2009 5:52 am

a4kquattro wrote:these turbos will probably only take me to mid 500whp, next up will be dual 2871's I think at which point I should be really pushing what the engine can take with stock internals. I dont mind blowing it up, so we'll see.

The rods should be good for about 80 hp per cylinder (they are real close in construction to the 2.slow rods, at least they aren't made from powdered metal!), it's the pistons I'd worry about.. I'm betting you can get 600 hp or so before a piston or valve gives it up.

my2000apb · Post by **my2000apb** » Thu Jul 16, 2009 7:27 am

600 chp? yea?~ 480 whp?

Post by **HT Motorsport** » Thu Jul 16, 2009 7:42 am

my2000apb wrote:600 chp? yea?~ 480 whp?

Given the old 3.6 was pushing more than 500WHP, Im guessing this 4.2 motor will push 600WHP without much effort.

The turbos were not spooling properly on the 3.6 due to lack of flow...

Can't wait to see the output numbers Mark. (You should probably take it for a test run down 101 tonight to make sure its good for abuse at WF

)

OOPS JUST loked back for plats and it was 400+ WHP not 500+ but that was waaay back in 2007 (Holy crap time flies) and was the first time the car was on the dyno with quite a few 'issues'

my2000apb · Post by **my2000apb** » Thu Jul 16, 2009 8:17 am

timmmy wrote:
my2000apb wrote:600 chp? yea?~ 480 whp?

Given the old 3.6 was pushing more than 500WHP, Im guessing this 4.2 motor will push 600WHP without much effort.

The turbos were not spooling properly on the 3.6 due to lack of flow...

Can't wait to see the output numbers Mark. (You should probably take it for a test run down 101 tonight to make sure its good for abuse at WF )

OOPS JUST loked back for plats and it was 400+ WHP not 500+ but that was waaay back in 2007 (Holy crap time flies) and was the first time the car was on the dyno with quite a few 'issues'

time will fly when you are having v8tt fun

Post by **Marc** » Fri Jul 17, 2009 7:31 am

car is loaded on the trailer. Still have serpentine issues, but this time around because the securing nut is not preventing the tensioner from moving. Its a pain in the balls to get to with everything together as well (radiator/engine/etc is in the way). I built a long reach 13mm wrench that I can use to pull it tight but it doesn't seem to hold for very long. I'll bring tools with me to try and fix it when I get there.

But man, even with very little dialing at all I remember why I like this car so much just ripping up Rt 125 for a few quick test miles :-D

Buckets · Post by **Buckets** » Sun Jul 19, 2009 1:45 pm

Wher you the coupe with the black wheels on the open trialer, or was it in your closed trailer i saw you pulling. you enter the show right behind us today.

Post by **Marc** » Mon Aug 17, 2009 12:35 pm

Chabaso: I was the one with the enclosed trailer, the other coupe was Janis's.

Project update: At waterfest my shift linkage crossover rod decided to break so I'm going to give the JHM spherical bearing setup a try:

I also need to diagnose the clutch hydraulic system because the clutch is not disengaging at the moment. Due to a bunch of deadlines hitting me all at once I wont have time to fix it for a few weeks tho :(

floridaquattro · Post by **floridaquattro** » Mon Aug 31, 2009 9:03 am

Have you had a chance to dyno the 4.2TT yet?

Post by **Marc** » Mon Aug 31, 2009 9:07 am

floridaquattro wrote:Have you had a chance to dyno the 4.2TT yet?

not yet, no. Things have been increadibly busy, I've spent maybe 2 hours on the car over the last 2 months. Hoping to resolve the remaining problems and get it on the dyno before winter time.

Post by **Hank** » Sun Nov 08, 2009 10:27 am

a4kquattro wrote:Here's a hint to my upcoming intercooling plans. Fan re-configuration (I'll probably add a 3rd fan to make sure there is enough flow):

Sorfof an uber old thread, but what radiator and fans did you use Marc? Are you happy with the fans performance for their size and do they do a good job of keeping the v8 happy?

chapel · Post by **chapel** » Sun Nov 08, 2009 10:35 pm

Holy crap. Need an update! Almost forgot you had this