Ok, I just got back from PR Motorsprots (for compression test...still good after 92K miles on motor) and DSR (dyno) in San Jose. Just dyno'ed my car w/ my new BNR Stage 3 upgrade (pics of the turbo to come). Results at 266 RWHP. I was somewhat disappointed becasue I was expecting more; oh well...Overall, I really like the turbo compared to my previous two hybrids (H and V trim...did not dyno either of them). The turbo spools up really nice and earlier than my previous units (contrary to my initial thoughts). Full boost by ~3300 RPM. Base dyno was at 7-8 psi and last run at 14 psi. I was running somewhat rich and lean at certain range (just minor tuning needed now). What you guys think about the power and my mods (only thing different is the turbo from the list)? Any recommendations on next mods?

By the way, after the last run, my car just died. It started back up again but idles really crappy now (gotta keep the rev up or sometimes it'll die on me as I drive it). I hope that it's just of the the vac lines pop'ed off or my ignition coils 9hence the missing lines in the dyno chart) and not my seal. I drove it to work and won't have a chance to drive it again until the end of the day. Any thoughts on this problem??? Thanks, Jay

 

Dyno chart

 

Dyno w/ A/F Ratio

 

Very nice numbers for the mods you have man. Hope the car is cool!!!

 

Pics of BNR turbo

 

Turbo pics

 

so how do tou like the mechs. at PR motorsports and who helped you was it Hector , he seems to be a pretty good mech. i been up there a couple of times and was surprised on all the rx7s they had

 

Hector compressioned my car. As always, they are a bunch of cool guys. I don't go there much, but I had something to do in Hayward toady so I figured I swing by for a comp test before I dyno. This is only my second time there, but I would say that they are very knowledgeable and highly recommend them. Jay

 

so how much did he charge you for the compression test, did they have a lot of other rx7s there also, cause when i went there they had like 5 fbs, 2 fcs 1 with a upgraded turbo and like 2 fds

 

$39 for compression. I did not see any 7's there, but I was not looking either (busy reading the new issue of R&D instead). Jay

 

Please tell me you have an upgraded intercooler if you're shoving 14psi through it...

You should have potential for more. I've seen about 250 and change from -

N1, RX-7 Fashion downpipe/midpipe
4 720cc injectors tuned with SuperAFC
HKS front mount
Rebuilt engine on stock ports
Cone intake, TID
~11psi on stock '89-91 turbo

BTW, this was all on a '90 turbo.

Your AF's are looking pretty darn lean down low - really need to beef that up. Below 3800 RPM on a TII is a problem spot - real easy to pop a motor with a lot of load there at low AF's. Your top end is getting too rich - you're pegging out the AF meter!

Anyhow, good start.

Dale

 

Those are good numbers with your mods.

 

 

a 3" exahaust would help too

mike

 

Nice to see proof! Does anyone else have some sheets to post?

 

Whats up all. Its nice to see the numbers. I think you lost some compression... Another guy with the same set up you have made 332RWHP at 14 psi. Just want to give you some comfort if you are disapointed with the results... Compression is everything!!!

Bryan
www.bnrsupercars.com

 

sorry to say thats not a vaccum line....your engine just about lost a seal. This is exactly what my engine did while it was going out, I would do some hard top end runs, while still not detonating, it was running a little lean. When I let off car died....after that, it idled like ****.....1 month later..................BAM!!!!!

new engine time......

 

um dont know if you know how to use the micrometer calipers or not but that pic shows the wron use of it. the calipers on the backside are used for measuring inside diameters. the inlet measurment would be a good bit bigger if you used the other side. anyway, im just being picky. good job on the turbo though. impressive numbers. hows spool-up with that turbo?

 

Is your motor ported at all? I have a very similar setup, Stage 3 BNR Turbo. But my motor is fully street ported & I am running 550 Primary 1000 secondaries. Also my ECU is programmed to max out at 83% duty at those levels of PSI. The motor still needs to be broke in when I finish rebuilding it next week. Then I will post dyno numbers, on a fresh motor.

 

doesn't it seem to anyone else that he's running INCREDIBLY rich?

 

Hi Bryan,
I did not mean to imply that I was disappointed w/ the turbo you built. I was disappointed w/ my power results, due mostly to my mods and the unknown status of my engine. I compressioned my car just 2 hours before the dyno so I am pretty sure it's within spec. I noticed that my IC was extremely hot after the second run and the 90 degrees weather did not help.

FC Drifter,
Sorry to tell you that I have a Master in Mechanical Engineering from UCSB. I probably use the caliper more in a year than most in their lifetime...how would you go about using the other side of the caliper if the inside surface is concaving and much deeper than the height of the caliper (if you do use the other side, you are only measuring the diameter of the outer most section of the concaving housing, not the compressor wheel)? The point was to show the approximate inside diameter of the compressor wheel. Nothing personal...just pointing out why I use the caliper that way. The turbo spools really nice. Getting into boost by 2600-2700RPM (earlier than my H trim hybrid) and full boost by about 3200. Pulls extremely hard past 4K. I ran a 13.7 w/ my previous H trim so I am pretty sure that this would put me in the mid 13 easily. My aim was for 300rwhp w/ other small mods and more fine tuning, but I guess that may not happen now. Maybe a new rebuilt will get me there.

Goodspeed,
****, I hope my motor is not blown. I was not planning for that yet. Don't know how to explain this to the wife since I just bought a GS400. Hope she understands my love for wankle power...Well, maybe this will give me a chance to get to know the guys at PR Motorsports better.

Barwick,
I was planning to fine tune the mixture more, but after 4th run, the motor died so that ended my session.

Jay

 

BoostingFC -

You didn't mention if you are running an upgraded intercooler or the stocker, which I'm interested to know. Complaining of an extremely hot IC after the second run leads me to believe you might be running the stocker. If so, you REALLY need to tone it down until you get that intercooler taken care of - if you haven't done so already, that can and will kill your motor!

Also, unless you've got your primaries really dialed down, you need bigger ones. You're DANGEROUSLY lean until the secondaries cross over. I've seen MANY FC motors pop below 3800 RPM. I really hope that rough idle is just a vacuum leak!

Upgrade your primaries and dial in your fuel, and I think you can make that 300 horse goal easily and *safely*. And get an intercooler if you haven't done so - if you're still on the stocker, stay at 10psi or lower until you do!

Dale

 

Damn... is this Mr. RX-7 Guru himself? The Florida badass?

Brad

 

nah i think hes just trying to be a nice guy and help out.

 

Hes telling it like it is. There is nothing I would object in that statement. His air charge temp is probably over 200F!!