Thread: Think I went with too big of a turbo...

Post convention caravan!



How much overlap do you think it's possible to dial back on the SR16's or even SR20VE's?

There are a lot of variables with dyno tuning too. Last time I went to dyno and tune I had to redo my tune on the street because elevation differences and dyno tuning was done a colder day.

The way this motor stands right now, with 210 psi compression, it will need new pistons anyway (DET pistons and rods). That's something I already am expecting and planning for I guess .

But timing aside, looking at Coheed's dynos I'm seeing the exact same issues. Maybe it's just the Protech logs, if it is then I'm SOL either way and will have to redo the manifold/downpipe/ic piping. Perhaps your luck with log manifolds comes from using much bigger turbos? Mine is still a baby compared to what I've seen on here....

Yeah man go for it! If he does we'll work something out cheap!

That manifold sucks willy! I would rather an ebay job. yeah sure it may crack earlier, but I would rather a braced ebay item. far less compromise.

How much are those pos's worth anyway!

p.s. Nothing against protec here, I am sure thats just their budget turbo manifold for guys converting. But that design is very compromised.

ps, coheed it looks like nearly 50hp at the same psi vet's to 16ve's. Seems like a lot to me at only 13-14psi

It will be the lamers convention.

C

QFTMFT.


Communism worked in theory too.

I see what you did there :golfclap:

Sent you both a PM



That's your typical log manifold though. Those are not cheap either, think the one I have was $300-400 new.

Now he went with a different size AR and twin scroll when he switched to 16VE's. Just something to consider.

you can not dial out overlap on the VE cams effectively without causing other issues. By taking out too much overlap on high cams, you produce a negative overlap on the low cams. This causes it to run like crap while it is on the low cams, and ruins the cam center so it doesn't work well at all.

This is not a tuning issue. Anyone who has actually tested it would know this. But who here has done the testing? Anyone else have documentation of their results?

when i datalogged the ex only cam switch, the maf voltage dropped noticeably so i didn't bother to dyno just the exhaust cam. By dyno results were based on JWT's suggestions back when i did that testing.

I battled for a long time to try to get power levels where i felt they should be. Now, power levels are very respectable on low boost, and still a little shy on the high boost power levels.

Im going with Coheed again. Nobody has put more time, money and dyno time into these setups than he has.

I highly doubt its a tuning issue. I know Vadim knows what he is doing when he is tuning his car. No reason he cant street tune his car at that power level. I did it to my last 2 setups and they were way more power. A 250-300whp car is much easier to handle and tune on the streets vs a 460-650whp car is when all you do is spin. But as far as my tune after fixing the ignition, it was perfectly fine, great a/f, smooth, no more knocking and made insane power all street tuned.

Nothing wrong with him street tuning his 300whp car. You can listen for knock, log knock and so on. All you need.

Like Coheed said you can only dial out soo much overlap before the car just runs like crap on the low lobes. You can probably get rid of about 10 deg and still have the idle manageable and run "ok" on the low lobes. VET cams are his only option for this setup if he wants to make more power and have more reliability and safer standings with the motor.

Again when you can show testing done then maybe we will talk.