Why is my spool slow?
 

Hello everyone,

This is my first experience with turbo on a miata.:noob: I've fitted the Begi S3 kit on my standard 1,6 '91 115hp engine. In my opinion the engine spools rather slowly, or at least I want it to spool faster : ) I reach the max of 11 to 14psi (depends on the outside temp) at 4300rpm...

I would like to have full spool on at least 3500rpm if possible???

I've read some spool data and noticed that most of the cars do better than my setup at the moment.

This is my setup:
- Garrett GT2560 Turbo with Ball Bearings and Water Cooling, ceramic coated
- Stainless Steel Separated Gases Downpipe 2,5"
- IC # 2 rated to 300 whp
- ceramic coated standard manifold
- ms2pnp with EBC (no variable tps)
- OBX catback system with cat replacement (open) I think 2"or2,25" not sure
- the original begi recirculate valve (looks crappy)

If needed I will post my current MS2pnp mapping or anything else to help me solve the issue.

what could solve my problem? bigger exhaust, better mapping, smaller turbo,or anything else...

thanks everybody

you have a 1.6L with a shitty exhaust.


fix these issues.

3" exhaust should make a big difference. And variable tps with better tuning probably wouldnt hurt.

1.8 swap would make the biggest improvement.

What exhaust would you advise? Has to fit on my current Begi downpipe.

I added my msq file, maybe someone could analyse it? I prefer a save tune above a "max power with risks" tune. Yes, I'm a woosy



Thanks for the fast reply

Use EBC, as it will aid spool by quite a bit.

Yes, I agree. But I will stick to the 1,6 for now. Upgrading to 1,8 will cost a lot of money. I would like to solve my problem on my 1,6 as good as possible...

I do use EBC, but for the moment it's not programmed in closed loop because I am not able to do it myself (lack of knowledge:vash:)

I've read some posts about it but still it's not very clear to me.

I have to learn a lot about programming my MS2!!

You prefer a safe tune, but a safe tune will mean slower spool than an aggressive tune. More timing = more complete burn = more exhaust gasses = more spool.

I wouldn't assume the tune is your problem until you can test with a good exhaust (3" straight through).

FIRST check for obvious problems:

- wastegate flapper valve is sitting slightly cracked open
- leaks in intake plumbing.

:giggle:

:laugh:

What about just drive with the downpipe and delete the rst of the exhaust for spool test?

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What's to test? We don't need to test 2" vs 3" exhaust, because 3" is better at every power level.

As a fellow 1.6 owner, I hate to say it, but if you want an improvement get a 1.8 w/ 3" exhaust. Or at least upgrade to 3" exhaust on the 1.6 and live with decent but not outstanding spool.

@FRT_Fun I agree, unfortunately you're right but I have to do with 1,6 for now...

@thenuge26 My idea was to remove the complete exhaust and test with only the downpipe fitted. Would this give the same results in spool as a 3" exhaust or am I completely wrong?

@JasonC SBB no leaks wastegate flapper complete closed

Can somebody check my mapping please???

which 3" exhaust brand would you guys prefer? Available in Europe if possible... Do I need a 3" downpipe too?

thanks

Most would probably recommend an enthuza 3" exhaust. And yes, the downpipe is probably the most important thing for you to fix right now. That thing is terrible.

Fireindc I think you are thinking of the other noob with spool problems, this guy has the Begi 2.5" sg dp, not that abortion from the other thread.

Going from a 2.5" dp to a 3" will still help though.

Sounds like you are in Europe, so shipping on an exhaust system would be quite expensive. I own and recommend Enthuza, but in this case I would either find a vendor in Europe or have an exhaust shop build one from scratch.

2.5" exhaust with a straight through muffler would be the setup I would go with. Not sure that 3" is really needed with a 1.6, but it wouldn't hurt either except for being more likely to drone.

3" vs 2.5" is still worth a significant improvement in spool at any power level.