turbo 2.9

88BII · Oct 11, 2008

has any one twin turboed a us spec 2.9? and if so how much boost can you through at it? just curious. i have two smaller T3 turbos and was just curious about it.

Wicked_Sludge · Oct 11, 2008

without some SERIOUS bottom end work, twin turboing would be a complete waste of time and money. even a small, quick spooling single turbo would be able to build enough pressure to vent one of the stock cast pistons.

turbo cat · Oct 11, 2008

2.9l and 4.0s can handle about 15-20 psi before breaking actually. Although any motor can break at any pressure level or NA. My 4.0L has taken over 15 and stills holding together after months of daily driven abuse. As far as twin T3s they will spool later than you probally want start with a single T3. What was the T3s off of? Look for a number on the exhaust side that says .##AR that will be the housing size. a single .48 or .68 would be nice. if you want to keep it alive you need a good fuel system and tuning and keep the boost under 10 Lbs

88BII · Oct 12, 2008

they are off a Chrysler 2.2. they are quite small and the spool would all be at the bottom and mid range, which is fine with me because i wheel it most off the time and i don't really drive over 65mph. lmk what you thinki

turbo cat · Oct 12, 2008

i have a single chrysler T3 (50 trim .48AR exhaust) on my bone stock 45.0 and its pushed 15psi without evidence of falling off up top. however its probally beyond the effecincy range of the turbo by then. It spools before max torque in most gears. Depending on the oad ive seen more than 10psi before 2K. I also only spent about 150$ on the kit.

someone else here has ran one chrysler T3 on a 2.9l as well and pushed it to 20 psi before the motor finally engulfed a piston. For your goals you dont need both of those turbos you would be better off just sticking one of them on and saving the other for a backup. Your setup is speed density right?

88BII · Oct 12, 2008

with a MAF or the current set up? the stock set uses a MAP sensor.

turbo cat · Oct 12, 2008

MAP=speed density. Theres very few options for tuning however Megasquirt could handle the task. There is alot of learning involved with mega

Psychopete · Oct 13, 2008

turbo cat said:
MAP=speed density. Theres very few options for tuning however Megasquirt could handle the task. There is alot of learning involved with mega

MAF would be the route I would go, also the guy who had the turbo 2.9L (BigBlockRanger) did a MAF conversion for his setup.

FWIW, My MAF setup currently on my '88 is going to be for sale soon. '90 California emmissions PCM for Auto trans. I've run into some mechanical problems and am swapping in a V8. I've been too lazy to get out there and rip my old engine out, but OTOH, I told myself I wouldn't rip it out until I had the new engine to put in ready.. Still need to get some odds and ends..

Pete

turbo cat · Oct 14, 2008

if you could figure out to use a system like megasquirt which is speed density it would work well. A MAF measures airflow. A MAP measures manifolds vaccum/pressure. Most high end turbocharged race cars run a MAP. The other issue is there is minimal tuning for the early EEC 4

turbo 2.9

88BII

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