I'm happy with my conservative timing maps up to 20psi and shouldn't need to push boost must past 22psi to reach my target rwhp # of 600.

I'm curious (feel free to PM me if you'd prefer not to let your secrets out in the open), to what advance and what split people are running on their 20+ psi beasts. I would be glad to share my current timing maps with anyone willing to share their experiences with me as well.

I've used guidelines which have been found on the forums from respected members as well as private conversations I've had with tuners to establish my current map, but few people have experience with > 20psi maps.

Consider this my solicitation for advise, I hope to someday return the favor to those individuals who step up to chat w/me, thanks!

K

 

I don't believe you have near enough compressor to pull 600 rwhp with a 3540...

 

oh, and wouldn't that to be an if I only made 550-580rwhp...

K

 

What compressor map do you have access to?! Or is it just an opinion with no facts?

Tony K.

 

Lol...

 

22 psi...600 rwhp..? Watch and see...I've only been doing this for 20 years....

 

old fart... Can't you let the young guys dream?

 

you'll be choked by turbine before compressor. the only limiting factor w/ the compressor is the heat the turbo produces by spinning too fast.

 

Wisdom is good. Just wanting to learn too. How are you getting to the conclusion? Need some data to run my own calculations on.

Does your wisdom say that 500 RWHP is not possible at under 17 psi too?

Been doing "things" just as long, but still learning...

 

well i made 413rwhp @ 13psi.... expecting 550 @ 20psi... we will see in a few months....

 

Got one local T-78 out to 425RWHP with some timing tweaks and still putting out 11.20 AFR @.78 Bar.

 

cool, is bar .78 * 14.7 = 11.46 psi ?

425 is awesome at even lower boost than me. WOW. my car was tuned low 11 's afr too. i need so much more tuning. i just don't want to break anything......

 

Have a read of this thread: https://www.rx7club.com/forum/showth...threadid=86068

Its about some of my dyno runs earlier in the year and the tuning that was used...

 

is bar the same as kg/cm2? places like greddy and others say 1 bar or kg/cm2 is equal to 14.22

.78 x 14.22 = 11.09 very nice #s for that amount of boost.

vosko what kind of split are you running right now?

I am running 10 degrees right now just flat across the range for safety reasons untill I get the wideband hooked up this weekend.

James

 

i have a wideband. i don't remember the split off the top of my head. i'm gonna download my map and see exactly what it looks like next week

 

At 22lbs you'll be in the 540-560 rwhp range. But you won't come close to 600rhwhp at that boost level. You'll need to run about 29-30psi to do that. Trust me, I've seen what Demetrios puts down with his turbo and its comparable to the Y2K. Your turbo just isn't going to flow enough cfm at that low of boost. Supra's with huge single turbo's barely make 600rwhp at 20psi range and they generally make about 100rwhp more at the same boost levels as RX7's due to the displacment advantage. I wish you the best of luck though..... Also, I've only seen two RX7 dyno sheets over 500rwhp on this forum that were legit.

 

Who cares about the dyno numbers.

I want to see nocabs timing maps

 

20 psi.... timing should be 14 degrees with an 8 degree split. i read at the top of the post about someone who made 425 rwhp @.78 bar????? i am sorry but that is bullshit!!! maybe 425 FWHP. i dont even think the almighty Pluto was able to do that!!!


MWW

 

413 @ 13psi
can you show us that dyno sheet again?
wasn't your boost unstable and bouncing to 18?

 

it held boost at 13psi but wastegate was opening and closing. verified with peak hold on the blitz sbc-id

 

You can get 600 rwhp with a full bridgeport at 20 psi if you have the right turbocharger (T51 Kai as example) and tune it well.

 

My bad. I mis-read the log file. It was at over 1 bar:

73.5 Inj Duty
16 IGL
8 IGT
7507 RPM
198 KPH
103 Boost
14 Knock
36 AirTemp
11.42 AFR
18 MAPN
17 MAPP

The car owner might speak...

 

GEE-SUS!! Vosko what was wrong with your car on that pull? does not look like WG fluctuations and it is not ignition either. maybe you had a vacuum leak , did you figure it out and if you did what did it pull after you fixed it?


MWW

 

I think mine did 425 RWHP at around 1 bar with a 11.0 A/F. That is on a stock T-78. I have upgraded the T-78 and will see what the difference is when the car is back up.

Jason

 

that dyno run was made the day after the blitz sbc-id was put in. the sbc-id has to learn the boost pattern. it learned it on the dyno by rapidly opening and closing the wastegate. that is why the dyno sheet looks cracked out. i haven't dyno'd it since. i broke first gear on my tranny after my spare tranny gets rebuilt i will dyno at 10psi,15psi,20psi, and 25psi if need be. that won't be for a month or so though