event

iTrader: (1)

Care to give my logs a critique? As you can see my spool is terrible. But I think it's more a limitation of the crush-bent DP. Any areas of improvement? Here is the dyno of these pulls. Run 3 is with the boost turned down to 11psi, it's in blue.



I've noticed that the boost drops a bit when it reaches the target, which means I need to play with closed loop boos control some more. That will help with the torque dip once spooled. Do I need some more timing during spool up?

Braineack

iTrader: (62)

you have a 1.6L with a crush bent DP.

fix both those things.


you are pushing the limits of your rods, fwiw.

event

iTrader: (1)

That's why I turned the boost down for the third run. I've read 250wtq is the limit, and not 250whp. Which is it?

I just added new wheels and tires and a roll bar, so I'll need to find a good deal on mani/dp. Miata funds this winter are already tight.

This much power shows that my manifold is good, right? So really, I just need a high-flowing downpipe? I'll see what some custom shops around here charge.

Braineack

iTrader: (62)

do you use HP to push your pistons down?

18psi

iTrader: (76)

fyi the earlier in the rev range that you hit the 250tq the higher probability that a rod calls it quits and promptly exits out the side

event

iTrader: (1)

I know that, but spooling at 4800-5000 sucks for autocross. Trying to improve that as much as I can. I was not expecting 250+hp and that's why I turned down the boost. I don't want to test out the 250wtq/250whp limit, whichever it may be.

Braineack

iTrader: (62)

everything you can do to improve flow/efficiency at this point is only going to help you.

event

iTrader: (1)

The question is then, do I want to spend ~$1000 for a bottom/side mount and DP which will have better spool than the top mount I have now, or spend ~$500 for just a big mandrel bent DP and stick with my current top mount manifold that is rock solid.

I'm not starting over with a 1.8L engine any time soon. I have plenty of power. More than I need actually. Spool is what I need now

18psi

iTrader: (76)

post pics and details of your setup so we can see what you're actually talking about

event

iTrader: (1)

Deets in sig. Here's the DP:
https://www.dropbox.com/sc/ft8fqswfo8uaezz/-zvr1eOleR

18psi

iTrader: (76)

that looks awful. and your sig still doesn't show us your manifold. based on that downpipe though, I'd say yes there is quite a bit of room for improvement in your setup

Mazduh

Like we said the other day. I'm sure if you had a decent flowing mani and downpipe your motor would have probably went pop on the dyno. lol

Fireindc

iTrader: (13)

LOL, that downpipe is really bad. Whats the manifold look like?

thenuge26

iTrader: (2)

A stock 1.8 can't make any more power than a stock 1.6, they both break at >~230wtq. The difference is the 1.8 spools better.

event

iTrader: (1)

https://www.dropbox.com/sc/drn90wccl5j0twv/5RA9FDy8Zy

There's the manifold. Sorry I don't have great pics installed while at work.

Fireindc

iTrader: (13)

Is that one of those old HKS units? The manifold actually looks much better than that downpipe, so I'd address the downpipe first and foremost.

event

iTrader: (1)

It is. However it mounts the turbo so damn high the DP is pretty much guaranteed to be spaghetti. Makes me wonder if it's worth it...