GT3076R?

[purplejzs]

  Currently finalizing the turbo stuff for my ranger. '89 foxbody 2.3 n/a engine, pretty much stock aside from fueling. Obviously this is way too much turbo for a stock non turbo 2.3, but the built engine is coming. I got my hands on an ebay GT3076 that I plan on putting on the truck before the built engine goes in, when I will be upgrading to a Garret G series. For the GT3076 though, those of you who are running that turbo, how does it spool? I believe it's a .82 a/r, so I'm hoping it'll spool later in the rpm range and I plan on running on spring pressure in hopes to not break a piston. 

[Stinger]

Is the the "R" ball bearing or is it the journal bearing version (you typed out both)?

I'd expect spooling to start around 4500 and not reach full boost until 5000 or so. Drop these numbers by 500ish RPM if it's ball bearing.

[purplejzs]

Whoops, my bad. It's non ball bearing, that's exactly what I was going for in terms of spool rpm. Thanks!

[purplejzs]

Just for future reference, if anyone comes across this post, it crosses over to positive boost around 2200rpm and is sitting on the wastegate at 8psi by 3300rpm. It will probably spool even faster once I turn the boost up. Definitely surprised the crap out of me in terms of lag!

[Stinger]

Thanks for the update and glad to hear it's working better than expected for you. The housing must be smaller than advertised.

[purplejzs]

You're probably right, here's a link for anyone curious. Butt dyno tell me its probably making ~160-180whp on 8psi and very conservative timing. Should have it on the dyno later this week, so I'll update once I have a for sure number. Not sure how far I can push it on the stock cast pistons but we will see.

[Stinger]

How far you can push it depends a LOT on the quality of the tune. They will hold quite a bit but an "oops" of going lean or too much timing or boost and you'll kill them.

[purplejzs]

Sounds good, the plan is to keep it safe enough to have fun while waiting on the built motor. What's the max hp/tq/whatever you'd recommend for a boosted n/a 2.3? I see that the consensus is around 400whp for a factory turbo car, but I can't seem to find good information on the true limits of n/a cast pistons.

[Stinger]

What ECU?
What injectors?
What fuel octane?
Do you have an intercooler?

[purplejzs]

It's on a PIMPx, 1100cc injectors from you guys with the FPR upgrade, probably 93 oct but we may throw some e85 in it once we finish the pump gas tune, and yes it's got a front mount intercooler.

[Stinger]

You can probably get away with low to mid teens body of you creep up on it. I'd try to avoid boost at more rpm as that makes a ton of cyl pressure.

[purplejzs]

Ended up calling it at 12psi as we were having some issues with the BCS. Made 216whp and sounded as healthy as could be!

[purplejzs]

Update on this, truck is currently down waiting for a boport head as the tired stock lifters couldn't handle all that extra cylinder pressure, and the cheap turbo washed out a thrust bearing. But, before the lifter and turbo died, I had it up to around 27psi on full e85 and it never showed a single issue with it. Bone stock n/a 2.3 with a felpro head gasket and arp head bolts. Obviously boost is really just a measurement of restriction and the stock head/wore down stock cam are a major restriction, but pretty impressive nonetheless! The plan is to crank the RPM up and really see what this bottom end is capable of once the head gets here.

[Stinger]

The E85 is helping a lot here as it's VERY hard to detonate with e85 and detonation is the main cause of failure. Regardless, that is pretty impressive as that's likely somewhere north of 350hp, possibly 375ish if timing is reasonable and if the valves weren't leaking substantially (I wouldn't be surprised if they were as the stock valve seats don't last long with a turbo).

[purplejzs]

For sure, I don't think anything in the head was very happy LOL. It felt really good though, excited to get the boport head on and really rev it out. The trans will probably be the next POF, it does not sound healthy at all.