2 Bolt Power?

[Atrosity]

Simple question, how much power can I squeeze out of my lil 2bolt on my vr4 reliably. I am wondering if I should go 19Ts or find another set of 16Ts/15Gs.

Edit: I want to say my engine is pretty healthy and is properly maintained. I have full supporting mods as well.

[Austin@STM]

Go 19t's for sure, pick up a new set so you wont have any headaches and then do some AWD burnouts ;)
The engine will take it fine, whether its a 2 or 4 bolt it will still get hurtthe same by detonation, which is the only thing thats really gonna hurt it.

[Atrosity]

Thanks austin, looks like i'll save for the extra penny on 19Ts.

On a thread derail side note, The Hallman MBC from you guys is so much better than my truboost!

[Ray Pampena]

forged crank? if its a cast crank 2 bolt its a little risky. not only do they break sometimes but they are always worn bad as to where the clearances are all huge

other than that, like Austin said.. the 2 bolt is just as good

[green-lantern]

IPO was pushing almost 800hp through a 2 bolt but I don't think his crank was cast.

[Atrosity]

forged crank? if its a cast crank 2 bolt its a little risky. not only do they break sometimes but they are always worn bad as to where the clearances are all huge

other than that, like Austin said.. the 2 bolt is just as good

I have a complete healthy stock engine hasn't been rebuilt with 130k. So....15Gs?

[Broomfield Racing]

My 19t's made 460awhp 495tq on my old NA 2 bolt block. Forged crank, stock TT pistons/rods. Also did 120+ traps alllll dayyyy long. Hundreds of passes were made on that block. But it was also rebuilt at one point, not sure by who.

I wouldnt be afraid unless its a cast crank like Ray says.

[Austin@STM]

Ya the hallmans kick ass, i set mine when we had it on the dyno a couple months ago and havent touched it since.

[Chris@Rvengeperformance]

don't let your crank determine your turbos. I'm running the cast crank (157,000 miles original crank) and if you are worried about it just don't run 20+ PSI.

No sense in buying new turbos again when you rebuild this engine. The lag difference between 16Ts and 19Ts will be so small you won't notice.

If you haven't yet replace the bearings and oil pump if you have a lot of miles. I changed mine in car at 138,000 miles and like Ray said the clearances were HUGE and oil pressure sucked nuts. They were worn most of the way through the damn copper. crank was fine.

[Fakepower]

get one of these and you'll be fine ....
http://www.3sgto.org/attachment.php?attachmentid=1381&d=1288629451

Or better yet add these and you'll be even better =)
http://www.3sgto.org/attachment.php?attachmentid=1382&d=1288629664

[ChargerX3]

I believe Chris claimed 700-750hp before his mains lifted.

[Atrosity]

My oil pressure has always been on the good side. :P I don't know when my oil pump was replace it has been but I have always been at a good pressure level. As you guys know the lmi shits took a crap so yeah just seeing what turbos I want to get and have my car still be reliable as it always been to me.

[Chris@Rvengeperformance]

My oil pressure has always been on the good side. :P I don't know when my oil pump was replace it has been but I have always been at a good pressure level. As you guys know the lmi shits took a crap so yeah just seeing what turbos I want to get and have my car still be reliable as it always been to me.

GOOD 19Ts won't hurt the car anymore than 16Ts if you are running 15 PSI. I've been running ~16.5 daily for a long time.

[Fakepower]

hey gump, can you run anymore boost with 91 octance? or you just limiting to 16psi for another reason?

[Atrosity]

GOOD 19Ts won't hurt the car anymore than 16Ts if you are running 15 PSI. I've been running ~16.5 daily for a long time.

Well I was running 18-20PSI on 16Ts with 550ccs bumped up fuel pressure to 610cc. :)
How much psi can I run?

[Austin@STM]

Well I was running 18-20PSI on 16Ts with 550ccs bumped up fuel pressure to 610cc. :)
How much psi can I run?

All of it.

[Chris@Rvengeperformance]

hey gump, can you run anymore boost with 91 octance? or you just limiting to 16psi for another reason?

I'm running 93, but I wouldn't say I'm limited to this boost, I just have not tuned higher. I have finally got my tune completely ironed out, I ended up having to pull up to 3 degrees of timing in some places to have zero knock and I finally got it consistently setup for about 11.0:1 AFR.

I'm aiming for 18 or so until I start tuning with meth. At that point this old engine may say enough, I don't know, it still has good oil pressure and doesn't use oil.

The biggest obstacle to my tune turned out to be lift throttle knock I thought was happening during the pull. I was going by the scanmaster a lot of the time and started logging a ton and saw that at 50% throttle I had a bunch of knock. Fattening it up at that TPS range solved it. I love the 16 rows of TPS airflow correction the e-manage can do.

Because I saw no knock when pulling at WOT it was really inconsistently knocking at lower throttle amounts, especially when letting off after a pull.

Yeah, I had to pull 3 degrees at 4000 and 5500, but by pulling that 3 degrees I kept the ecu from pulling timing. Even at 5 counts of knock my ECU was pulling about 4 degrees of timing (when I had 2 pulled out). Pulling out one more final degree avoided that and I have 3 degress MORE actual timing than before.

Lesson learned, even low knock counts can kill timing and don't be afraid to pull a little where you need to.

[BaadVR4]

Well I was running 18-20PSI on 16Ts with 550ccs bumped up fuel pressure to 610cc. :)
How much psi can I run?

You can run whatever you want; whether or not the engine stays together is the question. Up to about 500 HP, the determining factors will be the condition of the bottom end and the oil delivery system. Above 500 HP, the cast crankshaft becomes an issue. I have always said the cost of a total rebuild BEFORE it becomes necessary due to engine failure is cheap insurance. I would personally spend the money to rebuild the engine with an upgrade to a forged crankshaft now. Oh, BTW, "good" oil pressure isn't always a guarantee the oil delivery system is providing good lubrication. Indicated oil pressure can be affected by a restriction in the system, causing the gauge to read "good" while the actual delivery pressure/volume is not adequate. And, if you are relying on the stock oil pressure gauge, we all know how inaccurate they can be.
My point is this: rather than worry how much your engine can take before it blows up, spend the money on a bottom end that can take all the power you care to throw at it? Just my 1.5 cents worth.

[Ninja Performance]

I believe Chris claimed 700-750hp before his mains lifted.

More of a TQ issue. Right around 700AWTQ the girdle would push off the block.
I developed a 2 bolt girdle kit to help with this and made 747AWTQ without pushing the girdle.

And yes, my 2 bolt was oem forged crank, not cast. 3SX rods and Ross pistons, stock heads and cams.
747AWTQ 811AWHP.
My current build is 4 bolt and ran 835AWHP.

Anything under 650AWTQ or 700AWHP I would not hesitate running a 2 bolt with a forged crank.

-Chris

[Irocurstang]

How hard is is to change the oil pump out? I have 180,000 on my vr4 and it might be stock just thinkin about putting in a new one to be on the safe side

[donniekak]

don't let your crank determine your turbos. I'm running the cast crank (157,000 miles original crank) and if you are worried about it just don't run 20+ PSI.

No sense in buying new turbos again when you rebuild this engine. The lag difference between 16Ts and 19Ts will be so small you won't notice.

If you haven't yet replace the bearings and oil pump if you have a lot of miles. I changed mine in car at 138,000 miles and like Ray said the clearances were HUGE and oil pressure sucked nuts. They were worn most of the way through the damn copper. crank was fine.

If you are going to limit boost, why not run 13g's. I run all of my turbo's all out on e85. I would never buy upgraded turbo's before installing a forged crank.

[Chris@Rvengeperformance]

If you are going to limit boost, why not run 13g's. I run all of my turbo's all out on e85. I would never buy upgraded turbo's before installing a forged crank.

why buy turbos twice, it's a pita, I've been down that road. lots of people runnig 93 for many reasons.

[Atrosity]

Well I purchased some nice IPS 19Ts to replace my Shitty LMI 16Ts. I believe the plans for bboyalan and I are to stick with 550cc injectors and go water/meth injection shooting for 500 awhp. Just hope my engine stays together :)

[bboyalan]

This should be plenty of fun and most definitely exciting. You never know until you try, right? :D

[blindmist]

I built my 2-bolt with a forged crank, 3sx rods, and 3sx Ross pistons. I feel like I can handle anything. :)

[MaxClass]

I paid $220.00 for a forged crank to upgrade my '92 and had it turned to perfection with matching bearings. Cheap really.

Also went with the ARP 2 Bolt studs to make sure the bottom end was as strong as a 2 bolt could be. [ARP Part# 207-4205]

Also added Wiseco 8:1 pistons with new bore. Heads are Stage 3 with Brian Crower Cams [272] and 19t's. Should hold everything.

[Atrosity]

How hard is a forged crank installation?

[11secondFWD]

I made 400whp and ran 11's with a 2 bolt and cast crank. It handled the abuse no problem for years and the engine is still fine. I would say at 400whp range it would be fine for a long time. With more power, I would just go forged. Its worth it to be safe, plus its not that expensive.

[Atrosity]

I am looking to go 500 with meth injection how does that sound to you 11second?

[blindmist]

How hard is a forged crank installation?

The exact same effort as reinstalling a cast crank. You just have to get everything rebalanced.

[gst4g64]

I developed a 2 bolt girdle kit to help with this
I'd like more information about this.

[11secondFWD]

Well with 500 whp, I dont know how comfortable I would feel with the cast. Personally, I would talk to ray. I felt 100% confident with 400whp (on street) and 420( at track) but I dont have any experience with 500 whp. I think it would be fine for a while but long term, it could have catastrophic problems. I would upgrade to be safe and if you absolutely cant upgrade, why not just keep it in low 400's? I mean 400whp, is pretty fast. I was lighter with my 400whp, but it was extremely fast. It also will depend on the tuning skills and the condition of your engine. Mine was a jdm engine that had 70k km's on it, and was in perfect condition.