M42 turbo fact thread

[willworkfore30s]

Great info guys. It would be awesome to build an elaborate twin scroll set up. But if its not worth it, its not worth it.

[Dj Buttchug]

Honestly any DBB (or even journal bearing) T25 turbo will spool lightning quick and give any power you need. A T25 from a Nissan or the GT2860RS would be a great widely available turbo that could meet your goals.

this

Im running a gt2871rs Garret BB turbo from an S15 Sr20det. It begins building boost at 2300 rpm

[wazzu70]

For 250whp twin scroll is definitely not worth it. Any properly sized turbo for that power level will spool very quickly.

On the new BorgWarner EFR series turbos, the twin scroll turbine housing option was dropped because it did not provide any real benefit and just added to complexity.

If you want to see a nice twin scroll turbo manifold for M42 look up Bonje PPF. Be prepared to read Swedish or just look at pictures. :)

Honestly any DBB (or even journal bearing) T25 turbo will spool lightning quick and give any power you need. A T25 from a Nissan or the GT2860RS would be a great widely available turbo that could meet your goals.

[willworkfore30s]

I dont think so. With the small amount of us with turbo m42s theres not much demand for manifolds. From a business point of view it doesnt make sense to spend resourses designing something that one or two guys might buy. Do some research on manifolds and design one yourself. If you want to learn about turbo systems you might as well learn it all. Amirite?

I didn't mean does anyone produce a kit. I mean has anyone built a twin scroll m42 that I might could glean some knowledge from. I have done some research on it and it seems like the m42 could be a great candidate for it. Quick spooling and power in the lower rpm range is what the m42 is severely lacking.

My main concern is whether the juice is worth the squeeze. Are the gains significant enough to be worth the added cost it takes to due a proper twin scroll set up. In reading about its advantages it sounds like the way to go but I just wonder what it translates to in reality when compared to a single scroll set up on an m42.

I also wonder about fitting two waste gates and a turbo under the hood. I'd like to keep a/c (well, assuming I can get a/c working) and not have to cut a hole in the hood.

And is it worth it when my power goal is only 250hp?

[MF DOOM]

I dont think so. With the small amount of us with turbo m42s theres not much demand for manifolds. From a business point of view it doesnt make sense to spend resourses designing something that one or two guys might buy. Do some research on manifolds and design one yourself. If you want to learn about turbo systems you might as well learn it all. Amirite?

And a 45 minute drive is nothing. Here on monster isle its 4 hours to the nearest tuner. Theres a dyno but its owned by some headershop, they cannot fucking weld, and charge $120 for 3 runs.

As far the standalone goes, blueapplesoda build pnp ms system. 800 bucks or so

[willworkfore30s]

I'm fairly handy but this will be my first time messing with a turbo set up. Thats one of the big reasons I'm doing it. I want to learn. I am up to the challenge of standalone I believe. I do have a bit of concern though because the closet tuning shops are at least 45 minutes away. I'll look into VEMS.

Has anyone done a twin scroll set up on an m42 that any of you know of?

[wazzu70]

Yeah standalone gets fairly expensive quick and can be overwhelming for some people. On the other hand, with a turbo setup....its really the only way to have good control of the engine.

The other legit option is to have someone with experience in the matter make you a custom chip tune. Barrie from midnight tuning can offer this I believe.

FWIW, Im setting up my engine with VEMS which was the best system for the price I could find.

[willworkfore30s]

What would you suggest for engine management? Standalone can get expensive quick it seems.

[wazzu70]

You can easily hit that power level on stock internals, although replacing the bearings, rings, and giving it a hone is an excellent idea. Thats basically what I did on mine.

I agree the manifold with Jakes kit leaves a lot to be desired. I would much prefer to use one from Otis (Good&Tight).

Upgrading the valves and lifters will not be a good bang for the buck honestly. Put that money into engine management, turbo & tune to get the best results.

[willworkfore30s]

I have no problem using the stock internals as long as they will reliably hold up to my power goals assuming I have a good tune.

The motor I want to use has around 160k on it but I ran it very low oil a while back because I didn't get the oil canister lid sealed on very well. Now it is eating some oil but seems to run fine. Have taken it on a couple 4+ hr trips since then and drive it almost every day.

I thought I would tear it down and possibly get it re-honed with new rings. Maybe o-ring the block and get the head refreshed. I was planning to looking to upgrades to things like the valves and lifters. I am at the beginning of my research for this project.

I don't have it all figured out yet. I just know I want around 250 reliable hp and I want to learn about turbo's. The less money it takes to get there, the better but I'd like to stay under $3k if possible. I like the kit that was linked but would like a little more power and the manifold seems a bit restrictive with those t's.

[wazzu70]

I was thinking about getting a little more in depth than head studs and a tune. I was looking at a budget of around $3k including an engine refresh. I'd really like to be closer to the 250 whp range.

I want something that won't have me thinking I should have just thrown in an s52 and called it a day.

What do you mean more in depth? You can rebuild the bottom end if you want to factory spec if you are budget minded. If you want to spend some coin just because you should first spend on lower compression pistons, and then upgraded rods if you really want to.

No amount of engine building can save you from a crappy tune. For whatever reason people seem to overlook that and think some magic array of parts will protect from a poor tune. This is not the case.

Getting a quality turbo is one of the best places to spend your money. Youll get so much more out of this than buying needless engine internals.

[willworkfore30s]

I was thinking about getting a little more in depth than head studs and a tune. I was looking at a budget of around $3k including an engine refresh. I'd really like to be closer to the 250 whp range.

I want something that won't have me thinking I should have just thrown in an s52 and called it a day.

[e30guydownunder]

Head studs and a fresh gasket. Standalone ecu.

As long as the tune is spot on you shouldn't have an issue with stock compression or pistons. What will become an issue is when you wan to turn it up more :)

[MF DOOM]

http://www.r3vlimited.com/board/showthread.php?t=259174

[willworkfore30s]

So if you were looking to build a reliable m42 turbo to make 200-250whp, what components would you use to do it. Say you were budget minded but wanted to do it right.