[Rob@RBTurbo]

I agree with this 100%. This car has all the goods, mid 10s should be like a stroll the park. Maybe another bug or two in it, but once it's figured out he will begin taking mondo bites into progress. Although a big deal all things considered with records, this slip is of no real importance in the grand scheme of things.

Originally Posted by Slidewayz

High 10s ?

We want mid-10s, and my fearless prediction is you'll be doing them by the end of this year.

This is one amazing car, Shiv !

[Mark313]

This is why I keep visiting this site! To see new world records and all the progress that is being made! I'm glad you got the title back Shiv. You deserve it because you are the true pioneer of this platform! Congratulations. Can't wait to see you in the 10's.

Now over to b*mmerboost to see what the haters gotta say.

[themyst]

Originally Posted by shiv@vishnu

His car made over 510whp with very little top end power roll off. And within 8whp of my max tune ASR car which ran 20psi to redline. Running more boost on small frame twin turbos doesn't results in more power when the exhaust housing is the main power restriction. Same thing applies to stock turbos but at a lower power level. I've tuned enough RB/ASR/TD sized turbos to know that you aren't going to get much more out of them regardless of how high you crank up that boost. They are wonderful turbos if you are looking to make up to 500whp with an aggressive tune. And that is more than enough for most people. But let's not pretend they are something they are not.

The compressor/turbine has more in them. I've seen some unpublished work with an N20 sensor and you'd be surprised.

FWIW, you personally worked dzennos car on the dyno with procede. I KNOW you found gains upping the boost with little taper. With that said, yes there was more in that car than with the boost pressure this specific car ran.

Not sure why you're going on the defensive. I am merely pointing out that car was not "maxed out", similar to how the single turbo isn't anywhere close to maxed out for various reasons.

[OpenFlash]

Originally Posted by RobBeck

Congrats on the record! What boost was this at? What is the race weight? Looks like it hooks really well and rolls out, overall a really clean pass... So I suspect fairly low boost.

Race weight should be about 3500lbs with me in the car. Only deliberate weight saving mods are seat removal and Corbeau sport seat. And whatever else I saved on mods (turbo hardware, exhaust, wheels, etc,.) Looking at the datalog, the run wasn't too clean. I hit the rev limit in 1st gear and discharged most of my boost which is why 2nd gear didn't pull hard from the get go. Also looks like my revs dropped to under 2000rpm during the bog at the launch. Looks like i shifted too late on my 2-3 and 3-4 shift as well since throttle blade closed a bit. In a good run, the throttle blade will stay wide open from beginning to the end with boost never dropping more than 4-5psi between shifts.

Full run:


Zoomed in on the launch. Lots of room for improvement:


I ran the car at full boost 23-23.5psi. Judging by the logs, there is another ~0.3 seconds in there with a perfect pass even in these hot temps. Hopefully we will go back next week with the 2-step sorted out and with a bit more practice under my belt.

On my first pass of the day (first pass ever with slicks), i nearly hit the side wall of the track because the tires weren't warmed up properly and push each side of the car in different directions. My last run of the night was funny too. I could barely even keep the car in my lane during the entire run. I have it on video which I'll post later tonight.

Shiv

[OpenFlash]

Originally Posted by themyst

The compressor/turbine has more in them. I've seen some unpublished work with an N20 sensor and you'd be surprised.

FWIW, you personally worked dzennos car on the dyno with procede. I KNOW you found gains upping the boost with little taper. With that said, yes there was more in that car than with the boost pressure this specific car ran.

Not sure why you're going on the defensive. I am merely pointing out that car was not "maxed out", similar to how the single turbo isn't anywhere close to maxed out for various reasons.

I'm not being defensive. I'm being informative. On dzenno's car, just like every other ASR/RB turbo car I've tuned, I was struggling to hold 500whp to redline. That is a turbo limitation, not a map sensor limitation. When you see an RB turbo car make over 520whp, let me know. No question they can make more torque in the midrange with an upgraded MAP sensor by running more boost. But that won't really help in the 1/4 mile when revs rarely drop below 5500. And if you are getting timing flatlining now, what you see what you get a high boost/higher exhaust back pressure levels.

If you want to continue this topic of discussion, let's start another thread.

Shiv

[Presidio335xi]

Originally Posted by shiv@vishnu

Still, it ran well and put down a 11.105s @ 130.48 pass on the second run of the day.

Nice to see this done on a 6MT!!!!!!

You def. earned this one and we know it can get even better.

[themyst]

Originally Posted by shiv@vishnu

I'm not being defensive. I'm being informative. On dzenno's car, just like every other ASR/RB turbo car I've tuned, I was struggling to hold 500whp to redline. That is a turbo limitation, not a map sensor limitation. When you see an RB turbo car make over 520whp, let me know. No question they can make more torque in the midrange with an upgraded MAP sensor by running more boost. But that won't really help in the 1/4 mile when revs rarely drop below 5500. And if you are getting timing flatlining now, what you see what you get a high boost/higher exhaust back pressure levels.

If you want to continue this topic of discussion, let's start another thread.

Shiv

No ones saying you can make over 500 whp at redline on upgraded twins. My point is at 16 psi at redline there's more in them on THAT SPECIFIC CAR. Your testing would clearly show this.

PS Im not flatlining anymore. check your "Vishnu tech" thread.

[Velocity26]

Not sure what air pressure you are running on the slicks but it sounds like a few more pounds could help to resolve some of the issues. A small amount of spin could help you launch without bogging and then the extra pressure will take some of the wander out at the big end.

Good runs and I can't wait to see that small turbo auto hit the track.

[Jeff@TopGearSolutions]

Nice video, so glad you waited for that beetle to roll ahead cause that thing was a POS and ruining the video. Those slicks are a real work out to drive eh?

[OpenFlash]

Originally Posted by Velocity26

Not sure what air pressure you are running on the slicks but it sounds like a few more pounds could help to resolve some of the issues. A small amount of spin could help you launch without bogging and then the extra pressure will take some of the wander out at the big end.

Good runs and I can't wait to see that small turbo auto hit the track.

Thanks for the advice. I'll definitely give that a shot next time out. I was running 14psi tire pressure as suggested by Hoosier. But I suspect this is too low for anything other than a big block Chevy. A big turbo 3l can't make that kind of torque off the line.

[Velocity26]

Ideally, you are running with the minimum tire that you can hook with, anything bigger slows you down at the other end. Based on the little that I have seen, those tires seem a bit overkill for the power you are producing off the line.

[OpenFlash]

Originally Posted by Velocity26

Ideally, you are running with the minimum tire that you can hook with, anything bigger slows you down at the other end. Based on the little that I have seen, those tires seem a bit overkill for the power you are producing off the line.

I agree 100%. Unfortunately, going back to drag radials will result in wheelspin. So does it basically boils down to launching with more boost (and clutch slippage) and/or running high tire pressure? AFAIK, there is no smaller/narrower slick available that will fit a 17" rim.

[Velocity26]

You are likely right about the tire sizes, I would guess that you were running the 245 radials and the 275's are even shorter. They might give you a little more grip, but they would cost you a shift. I am sure that would be a net loss.

Good luck.

[Proper Motion LLC]

So what does the RB Turbo run in the final 1/8th and what does ur car run in the final 1/8th?

[jpsimon]

Shiv are you attending that next roll-on event? It would be awesome to see your single turbo up against a bunch of 335's of various stages of mods to put things in to perspective in a more real-world type of race

[OpenFlash]

Originally Posted by Rysandro

So what does the RB Turbo run in the final 1/8th and what does ur car run in the final 1/8th?

I can't say. I've never seen an RB car run at sac. Let alone one with a 6mt in 85F temp. For comparisons, my max tune 520whp ASR turbo set up (which made a bit more top end power than the RB set up i've seen/tuned) trapped at 126.5mph with drag radial in 60F temp. With 28" inch drag slicks and hotter temps, it probably would have done 124-125mph. But that is just an estimate. Would be great to see more upgraded turbo cars run up at Sac. I think the NHRA timing system adjustment last year scared a few people away since trap speeds dropped by 3-4mph. I know at least a few SoCal 335i guys who were unpleasantly surprised when they come up here last to run. They haven't been here since

[dj_335i]

Nice

[Irishace]

Nice shiv, congrats on the advancements.

[Proper Motion LLC]

What size are the tires?

[335iTurbo'd]

Originally Posted by shiv@vishnu

I agree 100%. Unfortunately, going back to drag radials will result in wheelspin. So does it basically boils down to launching with more boost (and clutch slippage) and/or running high tire pressure? AFAIK, there is no smaller/narrower slick available that will fit a 17" rim.

M&H just made a new size slick (26/8.5/17) that is a bias ply true slick. I will be mounting up a set on the K1's in the near future. May be worth looking into.

[E92TTKING]

WOW nice work

E85 map please!

[Dave W.]

Nice pass!
In the datalogs it looks like you're crossing the line at 6500rpm which is nearly optimal. I think a 26" tire would let you get off the line quicker and hit a better ET, but you might be bouncing off the rev limit as you cross the line. Keeping the 28" tire leaves room for advancement in the future. From what I've seen of your progress with the single kit I think you'll need it. Just add another 20 HP, practice the launch, tweak the tune to match and the times should continue to fall.

BTW thanks for posting the logs, it's great to see you sharing detailed info at this level.