Trackspeed Stage 2 VVT shortblock, EFR6758, CA91, 297whp/272wtq@17.5psi
 

Motor:

• Trackspeed "Stage 2" shortblock
  • 83.5mm Supertech 8.6:1 piston w/ thermal coating
  • Manley H-beam rods
  • ACL Race bearings
  • ARP head/main studs
  • Boundary Stage 2 oil pump
• OEM untouched BP6D head
• OEM valves
• OEM solid lifters
• Supertech heavy double valvesprings
• OEM BP6D cams
• OEM EUDM Squaretop manifold

Turbo:

• Trackspeed Turbo Kit w/ BW EFR6758 0.64a/r
• Precision 350hp intercooler
• prototype Trackspeed IC pipes
• Enthuza 3" exhaust

EMS/Fuel/Ignition:

• MSLabs MS3 Basic w/ CAN Wideband
• Innovate LC-2
• Injector Dynamics ID1000 (54%DC max)
• Deatschwerks DW300
• Rewired fuel pump (dedicated relay)
• OEM BP6D fuel rail
• Fuelab 535 FPR (60psi w/ reference)
• Fuelab 818 filter (6ppm Fiberglass media)
• CA91 pump gas
• prototype Trackspeed GM D585 coils

297whp, 272wtq, ~220kpa absolute. Boost curve is very solid. Peak of 17.5psi at 4000rpm, dips slightly to 17psi at 5900 before the controller drags it back up to 17.5psi at redline. It made ~275whp at 14psi so this is really all it wanted to do on pisswater CA91. I was fighting detonation in the spoolup range as low as 10psi. Advance is as low as 9 degrees through torque peak, rising to ~14deg at redline, so it really does not want to make more power than this. All in all, I'm happy with this at just 17.5psi on CA91, though. This is as far as I will go on pump gas. Next tank of fuel will be E85 and I will go back to get it dialed in, hopefully before MRLS.

New dyno spot for me, the owners say it is very comparable to a Dynojet and based on the BMEP figure (66.5tq/atm-L) I am inclined to believe them.

Attachment 229732

:likecat:

With E allowing you to add timing back in during spoolup, I bet you'll pick up a really healthy chunk of torque below peak.
And obviously everywhere else, but that part is a given.

are you relying on the oem knock sensor only or did you hook up cans too?

Lines up really close to my VVT+8.6+6758+Oregon 92. Couple degrees more timing, about 10 more hp at half a psi less.

Congrats. Will it be at MRLS?

OEM sensor. I break out each cylinder into its own line on the chart, which makes it pants-on-head easy to see detonation. If all the lines buzz along together, it's noise, but if one of them spikes, it's detonation. You can actually see the noise levels vary between cylinders based on sensor placement, since cyl2 and cyl3 are "noisier" than 1/4. With per-cylinder filtering on the MS3, I don't bother with mechanical det cans anymore. The computer has better ears than I do :party:

But what if they all detonate together :brain:

I wish there was a way to do things like that for knock detection and timing pulling. Instead of a knock threshold, look for differences between cylinders, or past values.

Yay, I've been doing something right. Made a ton of changes to my spark map doing this.

Do you do baseline 'runs' in neutral to see what the no load noise factor is?

Well, this is definitely something to look forward to.

make sure your fuel system is as nice as his too ;)

Nope. No need. The noise floor is very easy to set once you have a couple of no-detonation pulls logged. Just go 3-5% above the noise being generated on the noisiest cylinders (typically 2/3) and set the threshold there.

Thank you!

I'm just stoked that my motor is still alive... I was seeing spikes that went up to 58% in the midrange when I first started adjusting the map! I see things now in the low 20s at max.

/end thread derail

That is impressive, sir. 300whp on CA91, well done!

Nicely done. Subscribed to see the E85 numbers... will the extra fuel initiate full boost a lot sooner? Not that it's having any trouble spooling.

I'm trying here... pretty damn hard

I've been following the definitive VVT SWAP thread Savington posted and already have the 1990-1993 USDM fuel pressure regulator for my VVT motor and have a local friend for the 99-00 rail

I'm guessing cause you're running that expensive Fuel Lab it enables you to use the BP6D Rail? Should i expect any issues with the route i'm going? (Obviously yours is better)

Also how many shims are you running in this engine? On the website i see you recommend one - boundary recommends 2

In addition, you can scale the cylinders either directly in T/S (although by set %) [as below]:

https://cimg3.ibsrv.net/gimg/www.mia...82ad64b638.jpg

or by tweaking the min / max on the per cylinder traces on the logging, so that they all lie directly on top of one another.

This is super cool! I'll look this over when I have a running car again :/

Do you have dynos pushing the 6258?

n/m found it
https://www.miataturbo.net/dynos-tim...4016psi-94488/