Title: What boost is safe??
Post by: gsb876 on April 11, 2004, 12:58:44 PM
Post by: gsb876 on April 11, 2004, 12:58:44 PM
Anyone know what level of boost on a rotary is safe??
My car is very highly modded so can handle more than most, but does anyone have a level they think is safe??
My car is very highly modded so can handle more than most, but does anyone have a level they think is safe??
Title: What boost is safe??
Post by: GaryS on April 11, 2004, 03:06:06 PM
Post by: GaryS on April 11, 2004, 03:06:06 PM
I thought it was ~14 psi unless you had some serious engine work (dowelling, ceramic seals) done. I mgiht be wrong thoguh and that might be the limits of the stock turbos.
Title: What boost is safe??
Post by: tomrex on April 11, 2004, 03:35:50 PM
Post by: tomrex on April 11, 2004, 03:35:50 PM
hello
the higher your boost levels, the more fuel you need to get in so i\'d have a chat with a specialist before upping the boost and running lean!:)
tom
the higher your boost levels, the more fuel you need to get in so i\'d have a chat with a specialist before upping the boost and running lean!:)
tom
Title: What boost is safe??
Post by: Carl on April 11, 2004, 05:04:39 PM
Post by: Carl on April 11, 2004, 05:04:39 PM
The amount of boost all depends on the build and the state of tune.
You can run very high boost on a very HIGHLY MODDED ROTARY ENGINE but it must be very well tuned and the more you run the less time it will last.
Kind regards
Carl
You can run very high boost on a very HIGHLY MODDED ROTARY ENGINE but it must be very well tuned and the more you run the less time it will last.
Kind regards
Carl
Title: What boost is safe??
Post by: Fish on April 11, 2004, 06:01:43 PM
Post by: Fish on April 11, 2004, 06:01:43 PM
It all comes down to the person mapping it. Make sure that they know what they are doing, otherwise leave it stock.
Fish
Fish
Title: What boost is safe??
Post by: gsb876 on April 11, 2004, 06:06:12 PM
Post by: gsb876 on April 11, 2004, 06:06:12 PM
Thanks for the replies guys, basically the cars pretty well modded to say the least, the engine is street ported running a T-78 turbo with upgraded radiator/intercooler , hard pipe system and so forth, you say 14psi, whats that on the bar system ie:1.1bar??
Title: What boost is safe??
Post by: Carl on April 11, 2004, 06:26:12 PM
Post by: Carl on April 11, 2004, 06:26:12 PM
1 bar is 14.7 psi.
That means that the engine if it is running that air pressure is in actuality running at around 28 PSI of boost including natural air pressure,so the 14.7 psi is 14.7 psi over natural air pressure.
The zero on most boost guages shows where natural air pressure is.
Hope this helps.
Kind regards
Carl
That means that the engine if it is running that air pressure is in actuality running at around 28 PSI of boost including natural air pressure,so the 14.7 psi is 14.7 psi over natural air pressure.
The zero on most boost guages shows where natural air pressure is.
Hope this helps.
Kind regards
Carl
Title: What boost is safe??
Post by: scooby_si on April 11, 2004, 06:28:55 PM
Post by: scooby_si on April 11, 2004, 06:28:55 PM
not forgetting the power FC Gurj 
Si
Si
Title: What boost is safe??
Post by: 20B_boy on April 11, 2004, 07:13:57 PM
Post by: 20B_boy on April 11, 2004, 07:13:57 PM
QuoteOriginally posted by gsb876What fuel system do you have Gurj? what injectors and pump? What boost do you run?
Thanks for the replies guys, basically the cars pretty well modded to say the least, the engine is street ported running a T-78 turbo with upgraded radiator/intercooler, hard pipe system and so forth, you say 14psi, whats that on the bar system ie:1.1bar??
Title: What boost is safe??
Post by: gsb876 on April 11, 2004, 07:55:41 PM
Post by: gsb876 on April 11, 2004, 07:55:41 PM
QuoteOriginally posted by 20B_boy
What fuel system do you have Gurj? what injectors and pump? What boost do you run?
No idea:confused:
Normally i dont run more than 0.9bar just to be safe:(
Title: What boost is safe??
Post by: antnicuk on April 11, 2004, 08:39:17 PM
Post by: antnicuk on April 11, 2004, 08:39:17 PM
Carl,
you mentioned that 1 bar is 14.7, i have always heard conflicting stories, my profec instructions state 1 bar is 14.2 psi, but i have heard others say it 14.7, can you clear this up once and for all please.........:confused:
regards
tony
you mentioned that 1 bar is 14.7, i have always heard conflicting stories, my profec instructions state 1 bar is 14.2 psi, but i have heard others say it 14.7, can you clear this up once and for all please.........:confused:
regards
tony
Title: What boost is safe??
Post by: bnaellis on April 11, 2004, 08:50:14 PM
Post by: bnaellis on April 11, 2004, 08:50:14 PM
14.2 is measured in kilogram/centimeter2
the above measurement is what most jap boost gauges and boost controllers are reading in which is very close to measurements in bar but not the same.
the above measurement is what most jap boost gauges and boost controllers are reading in which is very close to measurements in bar but not the same.
Title: What boost is safe??
Post by: antnicuk on April 11, 2004, 08:56:39 PM
Post by: antnicuk on April 11, 2004, 08:56:39 PM
cheers for that brian, if that is the case, does the apexi commander read in bar or kilogram/centimeter2?
Title: What boost is safe??
Post by: 20B_boy on April 11, 2004, 10:19:11 PM
Post by: 20B_boy on April 11, 2004, 10:19:11 PM
Power FC is the same; reads kg/cm2.
Title: What boost is safe??
Post by: antnicuk on April 11, 2004, 10:24:05 PM
Post by: antnicuk on April 11, 2004, 10:24:05 PM
does anyone have a conversion table of some kind that they could post with Bar, psi and kg/cm2?
it would make life a lot easier when i\'m trying to work out what boost i am actually running.
regards
tony
it would make life a lot easier when i\'m trying to work out what boost i am actually running.
regards
tony
Title: What boost is safe??
Post by: JayDee on April 11, 2004, 10:56:09 PM
Post by: JayDee on April 11, 2004, 10:56:09 PM
1 bar is 14.5 psi under boost.
1 bar atmosphere is 14.7psi
1kg/mm is 14.22psi.;)
1 bar atmosphere is 14.7psi
1kg/mm is 14.22psi.;)
Title: What boost is safe??
Post by: rxangus on April 12, 2004, 08:42:13 AM
Post by: rxangus on April 12, 2004, 08:42:13 AM
Try this....
http://www.processassociates.com/process/convert/cf_prs.htm
Angus
http://www.processassociates.com/process/convert/cf_prs.htm
Angus
Title: What boost is safe??
Post by: Glenn Butcher on April 12, 2004, 09:37:34 AM
Post by: Glenn Butcher on April 12, 2004, 09:37:34 AM
1 bar on standard turbo\'s correctly mapped is about the limit - before you run into problems with boost spike\'s, creep etc.
A larger turbo is able to produce a larger volume of air, so a T78 on 1bar will produce more power, hence you need more fuel and more stress is caused to the engine i.e. dowelling is a good idea.
Mapping is very important - along with many other things to make it all work and stay together.
A larger turbo is able to produce a larger volume of air, so a T78 on 1bar will produce more power, hence you need more fuel and more stress is caused to the engine i.e. dowelling is a good idea.
Mapping is very important - along with many other things to make it all work and stay together.
Title: Re: What boost is safe??
Post by: Glenn Butcher on April 12, 2004, 09:47:41 AM
Post by: Glenn Butcher on April 12, 2004, 09:47:41 AM
QuoteOriginally posted by gsb876
Anyone know what level of boost on a rotary is safe??
My car is very highly modded so can handle more than most, but does anyone have a level they think is safe??
Oh - and to answer the question directly, only your engine builder/tuner can answer this question. If they are all bolt ons to even a modified engine you won\'t get anywere unless you have someone with the skills to tune it to a high but safe level.
Your car has to have the correct: fuel system requirements, ECU, mapping (with the proper tools/equipment), apex seals, etc. I wouldn\'t even think about increasing the boost until you had those things in place. And the obvious - once these things are in place get it to a RR, spend lots of time tuning it correctly as per above.
Rotaries can run up to 45psi of boost with large turbo\'s producing amazing amounts of power, but only with the right goodies and knowledge in doing it all.
Title: What boost is safe??
Post by: ScuttleRX on April 12, 2004, 12:07:57 PM
Post by: ScuttleRX on April 12, 2004, 12:07:57 PM
heres a good site for future boost pressure conversions
http://www.onlineconversion.com/
hundreds of others too:)
http://www.onlineconversion.com/
hundreds of others too:)
Title: Re: Re: What boost is safe??
Post by: Carl on April 12, 2004, 01:40:34 PM
Post by: Carl on April 12, 2004, 01:40:34 PM
QuoteOriginally posted by gbutcher
Rotaries can run up to 45psi of boost with large turbo\'s producing amazing amounts of power, but only with the right goodies and knowledge in doing it all.
And the right fuel,often the really hi HP engines are running methanol.
Kind regards
Carl
Title: What boost is safe??
Post by: gsb876 on April 12, 2004, 03:46:12 PM
Post by: gsb876 on April 12, 2004, 03:46:12 PM
Thanks for all info guys really appreciate it:)
I dont actually intend to race the car or anything but like to know the limitations just in case, so far ran the car at 1.0bar just to see and it seems fine at that running to 7000rpm\'s also been checking the knock reading so far not moved off 1, so thats pretty good unless its not working:rollin :rollin
But thanks for all the info:wave
I dont actually intend to race the car or anything but like to know the limitations just in case, so far ran the car at 1.0bar just to see and it seems fine at that running to 7000rpm\'s also been checking the knock reading so far not moved off 1, so thats pretty good unless its not working:rollin :rollin
But thanks for all the info:wave