I just had my car on a dynojet again, this time it was with full non-sequential stock turbos. 368.88 RWHP, 335 torque, and max boost was 21.7 psi on the greddy profec b-spec 2 boost controller. When it hits full boost it goes up to 21 psi, then it drops down to 19 psi and holds steady all the way to redline, it actually starts creeping back up to 20 psi at the redline. Dyno sheets will be uploaded in the next post. When you look at the dyno sheet, you can see max hp is at 6k rpms, this is probably the rpm when boosting 21 psi, then you can see the hp drops down as the boost dropped down to 19 psi.

I also did the first dyno pull at my low boost setting, it peaked at 16.7 psi and it probably held at 15-16 psi since it always peaks higher than it holds after it peaks (I was watching the AFRs not the boost gauge). It only made 313 HP! This all proves to people who say that these turbos don't make any more power above 15 psi, they really can make much more power above 15 psi! 55 HP is a big difference.

And to add to that, my 2nd pull I made 362 HP, I turned up the boost a very small amount (from 67 to 69 on the boost controller) and made 368 HP on the 3rd pull.

My other thread is "342 hp dyno & 11.19 @ 123.80 video", that was when my car was on the dyno and only hit 19 psi on the dyno and its only been holding 17 psi boost at the track running 11.16 ET, I just found and fixed two big boost leaks from both bad gaskets in the turbo ypipe.

I think I will now hit 10s easily. I've done 11.16 and 11.19 when my car was making less HP and was heavier.

 

isn't dynojet readings uncorrected? Wouldn't you actually be making more power?

That's awesome man!

 

Run Conditions: 55.59 F, 29.14 in-Hg, Humidity 31%, SAE: .99

374.34 HP Uncorrected

 

Damn dude nice numbers. I read your other thread too. Way to dispel the disbeliefs! Let us know when you smack 10s in the face.

 

yeah but on a mustang dyno it would have read 40-60 hp less. i made 324 rwhp on a mustang dyno @14psi...... congrats either way.

 

Here is a graph that compares today's low boost VS High boost, and shows my HP from last year when I had the stock sequential twins and was making a little less boost then on the dyno.

 

Ya that's really good on a mustang dyno and only 14 psi. I don't know why my car doesn't make much HP until much higher boost, it makes me wonder if I need a new engine and then how much power I could make. But my motor didn't lose anything compared to 14 months ago, and I've been running lots of boost and drag racing and all on 93 pump gas.

 

wow, nice numbers. btw, what was the afr?

 

yeah, i dont know what your mods were, this was done at japtrix in riveara beach fl. so it was hot as **** outside when it was done.

i had the 99' turbo's. greddy 2row fmic, and elbow. koyo rad, m2 downpipe, catless mid pipe, and a single tip 3" catback system. hks twin intakes, and the aem ems.

 

It stayed between 11.1 - 11.4 AFR on my PLX R-500, mostly 11.1-11.2. I made sure they were all good on the highway the other night, late at night. I did have to add a little more fuel in the PFC after putting on the non-sequential turbos.

 

Good numbers... Ya know if you switched to BNR's you would be above 400 RWHP probaly around 430 ish

 

Ya If I wanted to be in further credit card debt lol, the non-sequentials were only like $200 so that fit my price range for now.

And I'd like to hit 10s and set a record for the fastest 1/4 mile RX7 with stock turbos and stock engine

Thanks.

 

Here is the dyno graph with the torque curves. As you can see there was a huge difference between sequential and non-sequential. But the car still feels fast at the low rpms, it doesn't feel slow, I have no complaints. Sure it was really nice to have the sequential system for that low end power, but I'm trying to get max power so I had to lose the sequentials and that low end power, and I don't regret it. I also got to lose 10 lbs of weight from removing everything from the sequential setup so that is nice.

 

Im assuming your old turbos finally blew?? I would have loved to seen the numbers you had made with them going from Seq to non-seq. These new turbos may not be in as good of shape as you thought.

I wouldnt say 10s are easy yet I know you can launch the car really well but it is a different ballgame when launching non-seq compared to seq. Nice numbers either way.

 

No the turbos didn't blow, they still worked, well they still boosted good. I thought they were getting tired or something cause I wasn't boosting above 18 psi, but I wanted to go full non-seq. for maximum power from the stock twins so I got them, and I found both ypipe gaskets were blown out so that's why I couldn't get my old stock turbos to boost over 18 psi anymore and why I was only running 17 psi at the track this year but still ran 11.16. But the old turbos did just recently start to blow out alot of smoke after I let off the gas, and I think they may have been leaking coolant too, it was all wet inside the manifold. Maybe you are right about the newer turbos.

I thought it should launch the same, I launch at 7k rpms and it doesn't drop below 5k during the launch, both turbos were working during the launch, there was no waiting for the 2nd turbo to kick in.

 

I have like the same mods, Power FC plus a fuel system and more boost, but no 99 turbos, and no tuning of the timing maps. And it was much colder than that here.

 

I think a lot of people doubted the efficiency under higher boost because, well, you would think they would be inefficient... and I'm sure they are running out of efficiency, but they are still making more power. But no doubt, you are shortening their life as you know. Few people are going to do the tests you are doing because they don't want to risk the motor, but you've already gotten your money's worth out of that keg so why not keep pushing?

You are on straight 93 pump gas? What timing at 21psi?

 

Yes. Whatever comes with the power fc timing maps, I havent changed them although I would like to. Map trace shows the last row being used in the maps.

 

wow so you're using the base mod timing maps that come in the pfc? that is pretty impressive since it's tailored for a sequential car.

 

Perhaps it's the base map that's letting you down after 6k... With specified tuning you could probably make even more power.

 

Yea, I def. need a tune.

 

Yes. I do want to look at some other peoples timing maps and see what can be changed safely.

 

nice numbers. and way to push those stockers.. I think you can get into the upper 10's with that set up but sooner or later you will need to make the change !!!

 

actually, the leading timing on the PFC basemap isn't all that bad. It's the split that's pretty aggressive and not very safe for 21psi on pump gas. For a quick safety measure, go into your commander and change the last 4 rows to a split of 12. Since the Commander can't calculate split for you easily, here is what it should be. This is assuming you have a completely stock leading map.

stock leading map

https://www.rx7club.com/attachment.p...1&d=1229641720

stock trailing map

https://www.rx7club.com/attachment.p...1&d=1229641720

modified trailing map for 12 split over about 10psi to improve safety

https://www.rx7club.com/attachment.p...1&d=1229641720

 

Hey thanks so much for all that. I look into that after work.