Dyno: Mx5/Miata FE-dohc swap 302rwhp 281ftlbs

[M2cupcar]

After a year and half I finally made it back to the dyno. Upgraded the intercooler to solve the high intake air temps, did some street tuning and got the EBC working. Made four runs at 16psi (what I've been tuning/running on the street) on pump gas with some ign/fuel tweaking. Hit a dead end on the top end - I think the 1.6 Miata/MX5 throttle body and manifold might be choking the engine. Looking at the HP curve, I think there's a bunch hp missing up top with this turbo and engine. - rob



Specs-
engine: Bone stock FE-dohc 2.0L with FE3n cams on pump gas
ignition: stock 1.6, cas driven
emu: MiataLINK FM software
intake: 1.6 throttle body, 1/2 1.6 manifold on top of 1/2 Kia Sportage manifold, 3x12x18 core b&p eBay intercooler
fuel: Supra pump, rx7 550cc injectors (82% dc)
turbo: t3/t4 50trim 60AR stage3 48AR
exhaust: OE Mercedes internal gate with 2.5" exit to 3" exhaust with 200 cell metal core cat, 18" glasspack and turbo style muffler:

[compnut21]

good job!

[XR2B6T]

Sweet! Karma for you! Do you have any pics of the car and engine?

[RbluEMx6]

Great results.

[M2cupcar]

random images










and the IGN table for reference (divide by 4):

[SABBAi]

Very nice looking setup. I like how you've built the intake manifold, very neat.

[fredio54]

Rob, you suck :-p

Mostly for linking all these pics when your project is linked from the sticky thread ;-)

Not a bad dyno, but while you were taking the piss out of my engine pics for always having socks in the ports etc, someone was clearly filling your inlet with some too ;-)

Time for that sweet alloy inlet is it? :-)

Fred.

[M2cupcar]

I had no idea pics/car were linked in the sticky. But then I suppose everything mentioned prior to it's creation is linked (if the linker did a good job).

No socks, nothing in there, just a bad idea proven true. Actually it's good idea if you like short shifting and a simple solution to packaging.

[zlyricist]

you say it might be missing some hp in the top end. but the curve looks pretty damn good

[defiler]

I can only imagine what 300hp in a little Miata feel like

[fredio54]

Originally Posted by zlyricist

you say it might be missing some hp in the top end. but the curve looks pretty damn good

Rob will do better soon enough. You are comparing with the f2t curves right? ;-)

[PGTF2T]

what compression does your engine have? if 10:1, i was under the impression 250whp was the max you could hit on pump gas with out meth injection or another adder.

Thanks Brandon

[Low'N'Slow]

Very very nice, good job.
how much does the car weigh roughly?
specs will be usefull for my build, cheers

Chris

[M2cupcar]

I haven't pulled the head to make a positive ID on the compression, but I've looked in the plug hole and tried dragging various things across the piston top and nothing has led me to believe there is a dome (ridge). Add to that the fact that I had no sign of knock on any of the pulls with that timing on pump gas, and I doubt it's a high compression FE. But Fred thinks otherwise.

I'm guessing (hoping) the car weighs about 2350lbs (1065kg).

Though I really want to continue to work on the power, the real issue is driveline. I've never drag raced the car, only done one clutch dump and in 2k miles I'm already on my second Miata/MX5 transmission. I think all the 4th gear tuning pulls wear hard on the little transmission with that much torque.

[compnut21]

with mine the ridge was semi-obvious. i used a nice led flashlight and looked in the spark plug hole. there was a circle the size of the spark plug that was raised maybe a mm or so, but just enough to see.