Turbo manifold design

[speedjunkie]

Yeah I'm really hoping to do as short and straight as possible, or at least gentle bends actually. What do you mean no cheating on the entrance? I know I'm just being finicky here, but anything that will help with faster spool is what I'm after.

That's an interesting manifold, I've never seen one done like that before. I don't remember, does the RX-8 exhaust come out of the irons too instead of the housings? Is that why there are 3 ports on there?

Yeah I'm curious too haha. Unfortunately I won't be able to provide any dyno results since I don't dare get on another one HAHA. All I'll be able to do is give a report on what the butt dyno tells me, how fast it spools and all that. Also, I'll be at a disadvantage due to the 6000' altitude as well, but I do plan on taking this to DGRR this year (assuming I can get it all done in time), so that should give me a better idea of what it will do near sea level. Otherwise I guess I'll run the current turbo out there. Either way, I'm sure I'll be reporting whether I'm happy or not haha. MAYBE I'll get on the dyno just to do a couple pulls, but no tuning, that's when tragedy strikes. I've been fairly lucky enough with just dyno pulls though.

[TitaniumTT]

Originally Posted by speedjunkie

Yeah I'm really hoping to do as short and straight as possible, or at least gentle bends actually. What do you mean no cheating on the entrance? I know I'm just being finicky here, but anything that will help with faster spool is what I'm after.

That's an interesting manifold, I've never seen one done like that before. I don't remember, does the RX-8 exhaust come out of the irons too instead of the housings? Is that why there are 3 ports on there?

Yeah I'm curious too haha. Unfortunately I won't be able to provide any dyno results since I don't dare get on another one HAHA. All I'll be able to do is give a report on what the butt dyno tells me, how fast it spools and all that. Also, I'll be at a disadvantage due to the 6000' altitude as well, but I do plan on taking this to DGRR this year (assuming I can get it all done in time), so that should give me a better idea of what it will do near sea level. Otherwise I guess I'll run the current turbo out there. Either way, I'm sure I'll be reporting whether I'm happy or not haha. MAYBE I'll get on the dyno just to do a couple pulls, but no tuning, that's when tragedy strikes. I've been fairly lucky enough with just dyno pulls though.

Hey Eric.... basically as far as the exhaust goes, the theory states as for turbo engines that the longer the runners, the more top end power you'll get for a variety of reasons. However, you're after response anyway.

As Peter pointed out, take a look at the Twins Turbo manifold. Beautifully constructed, out side the box thinking, not all that impressive numbers.

As for your tuning experiences.... get a better dyno guy!

What's breaking and what boost, timing, AFR's etc etc etc...

[RICE RACING]

http://www.youtube.com/watch?v=3kyJW...eature=related

^ These cunts know a thing or two about head jobs.

12minutes into this EPIC VIDEO (History lesson) BMW powered Benetton = 1350bhp and ~650kg actually has more power than the official media quoted figures, watch the video and be prepared to shit your panties! Actual power is around 1400+bhp as BMW could never measure the power properly as their dyno stopped at 1400!!!

25 years ago
1.5lt engine
STOCK ENGINE BLOCK
10,500rpm
102 oct petrol
water injection on the Renault and Ferrari
water sprays on intercoolers
5.5bar absolute pressures

NO THE VIDEO IS NOT IN FAST FORWARD!!!!



watch and learn!

[Libor]

Originally Posted by RICE RACING

^ These cunts know a thing or two about head jobs.

That Benetton is just ridiculous

Peter, what do you think is the cause of better midrange torque with plumbed wastegate? This thing shocked me, as it shouldn't enhance volumetric efficiency and hence airflow per cycle. It must be something related to wastegate valve position and how far its opened vs. target boost? I´m lost in this

[RICE RACING]

Originally Posted by Libor

That Benetton is just ridiculous

Peter, what do you think is the cause of better midrange torque with plumbed wastegate? This thing shocked me, as it shouldn't enhance volumetric efficiency and hence airflow per cycle. It must be something related to wastegate valve position and how far its opened vs. target boost? I´m lost in this

Yeah the BMW Benetton (Toleman IMHO) is just gag factor to the maX! its a real history lesson in making a fast turbo car.

I have not much of an idea as to why it makes more power, except that there is some complex interactions between the intake and exhaust as TTT suggests. For the street its a nice side benefit, its way WAY to fucking loud to have any turbo 13B that does not have at least two big mufflers and a WG going through the main exhaust system.

My car is very loud when its on 30psi boost! its just a pure function of the power being made, the more boost I have run the more loud it is, when I trialed it with just one muffler it was totally abhorrent and not usable on the road in any way shape of form.... anyway I know some don't care about noise etc, but to me to stay undercover it is important

[yzf-r1]

Originally Posted by RICE RACING

when I trialed it with just one muffler it was totally abhorrent and not usable on the road in any way shape of form....

No issues with the smaller IC running water?

[RICE RACING]

Originally Posted by yzf-r1

No issues with the smaller IC running water?

I have run over 34psi boost pressure on my set up & on a 20 deg Ambient day my air inlet temperature as measured in the stock location in the upper inlet manifold is less than 50 deg C in the top of 4th gear

In more normal boost settings at around 27psi its always under 45 deg C

I run water injection and an intercooler spray system it is unbelievable, lets me keep the historical aspect of my car (stock parts) but still have almost 700bhp from the engine if I choose to do so

[speedjunkie]

Originally Posted by TitaniumTT

Hey Eric.... basically as far as the exhaust goes, the theory states as for turbo engines that the longer the runners, the more top end power you'll get for a variety of reasons. However, you're after response anyway.

As Peter pointed out, take a look at the Twins Turbo manifold. Beautifully constructed, out side the box thinking, not all that impressive numbers.

As for your tuning experiences.... get a better dyno guy!

What's breaking and what boost, timing, AFR's etc etc etc...

Yeah I'm going to stick with shorter runners, as short as possible anyway.

It actually wasn't the tuner's fault in either case, it was just one of those things. Well, the first turbo I lost was my fault because I didn't put a restrictor in the oil line (didn't know I had to back then haha) and it blew the oil seals out on the first run, so that was my fault. Then when I lost my engine last Jan, I think it was going to go at any moment anyway, it was time to give up the ghost and it just so happened to be on the dyno. Actually that one was due to the rear bearing, so I'm thinking it might have been a blockage in the e-shaft or something and not providing oil, not sure. This time I don't know what the hell happened, but it hadn't even made it to the dyno yet when it started burning oil, during break in! But I'm still not 100% sure it's the engine just yet. But when I did get it on the dyno, that guy didn't know his ass from his elbow and changed the tune/timing so much that it killed it and wouldn't start again unless we popped the clutch with the truck pulling it. Once I changed the timing it would start again, but still acts weird, almost like it's flooding every time. And I'm sure as shit not going back to that place haha. And he supposedly used to have an FD and tunes a lot of them, that's doubtful. He sure isn't tuning mine anymore. Not only that, I spent 3 hours the night prior setting up my TB for a perfect idle, and then this dipshit started messing with it and screwed it up. But each of these times have been at different tuners anyway.