Single Turbo RX-7's Questions about all aspects of single turbo setups.

Limits Of Pump Gas (93) And Realistic Goal Questions Per My Build

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Old Feb 19, 2012 | 02:28 PM
  #26  
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You have to get a good kit for AI and set it up good so that it is reliable and doesn't have problems. So if not careful it can be another unreliable system and if it fails without you knowing then I guess you are much more likely to blow the engine with pump gas. I've had water lines come disconnected, problems with my progressive controller which caused damage to my turbo impeller blades, and problems with the check valve which resulted in the engine sucking in too much water and possibly causing a loss in compression.

So you just have to be really careful and keep an eye on everything, it is more to worry about but It's worth it.
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Old Feb 24, 2012 | 04:07 AM
  #27  
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We are always between 380-450rwhp sometimes higher on pump gas depending on boost levels and other variables. 98 octane which i here is similar to your 93.
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Old Feb 29, 2012 | 09:56 AM
  #28  
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Originally Posted by Mindphrame
Interesting developments on the injectors derail, that is some rather cool information. I’ll be honest; I did not do any research on the injectors beforehand. I trusted Chris to know what injectors were the best options for my application. I told him to put what injectors he thought I needed and I went with his recommendation. I figured he knew best.

In regard to AI:

My confidence has been shaken a bit. When I called and spoke with Chris, he did not seem thrilled by the idea at all. I got a vibe of “why?” from the conversation. He did state that he didn’t like gimmicks and thought the practice of using water/meth injection in lieu of race gas was unwise (paraphrased, of course). When I told him I’d have him tune the car without AI running, then use it as an added safety blanket, he didn’t outright shoot the idea down, but I still got the feeling he was telling me it wasn’t really necessary/worth it. He stood firm to his 350 hp is the most he would want to tune the car for while using pump gas, after that you need to get fuel from a can. While I would love to have high/normal/low boost settings ready at the flip of a switch, it doesn’t appear like he would feel comfortable tuning the car higher than 350 with AI support anyway.

Eh, well I’m still on the fence about it. It does seem like such a good idea… I really wish I had more time to sit around and research this.

Anyway, I guess the overall answer is that the build is fully capable of 400+ whp, however, this number (and yes I agree it is just a number, but I’m using it as a point of reference) is unreliable/unsafe for the engine without utilizing race gas due to fear of pre-detonation even with 3mm apex seals. AI, when utilized to negate the necessity of race gas, is considered an unwise gimmick of questionable reliability by one of the better/well established rotary experts and is not recommended.

That said, something tells me that I’ll feel the itch to kindly disregard that wise advice and a craving for the extra power of higher boost will surface at some point…which makes me think I should have the AI installed and ready for my juvenile side to rear its ugly head and muddle with my sense of reason.
350whp on a ported REW engine is on the low side for a 35R. You can see from my signature I am making 386whp on a stock port at 15psi. This was tuned conservatively by Dave at SpeedOne (KD).

If your tuner's plan was to only make 350hp, then you could have chosen a much smaller turbo that would be equal or quicker on spool. It would definitely be less expensive.

AI is a damn reliability mod. Even if the tune and setup is very far from pump limits, the benefit of carbon reduction alone is worth installing a few hundred dollar switched system. AI has been proven time and time and time again to be great for rotaries.

Power and limits are all relative. You can make 500whp every day with AI. Does it greatly reduce reliability... Sort of. The better question is, does it greatly increase WEAR on the engine. YES!

As mentioned above, its all about setup. The chance of an AI system failing and blowing your engine should be no greater than your fuel pump failing.
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Old Feb 29, 2012 | 12:55 PM
  #29  
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I will add that my 35R is Aspec's modified GT500.... However, it is still a T3 on stock port engine.
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Old Mar 1, 2012 | 09:39 PM
  #30  
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Seems like alot of old school tuners dont like the idea of a.i.
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Old Mar 2, 2012 | 12:02 AM
  #31  
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Thinking about getting the AEM kit.. It only seems to make sense to have it if you are more than a conservative tune
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Old Mar 2, 2012 | 12:15 AM
  #32  
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The aem progressive controller is low quality and same with the built in check valve in the injector body.
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Old Mar 2, 2012 | 01:33 AM
  #33  
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I didn't read thru all the posts but just the last few. My feelings are tune safe with pump 93 then add q16 for the big tune. Yes pricey but I look at it as another mod. Q16 or c16 will give you a greater window for era. Don't skimp on the fuel.
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Old Mar 4, 2012 | 07:24 AM
  #34  
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Originally Posted by XLR8
I will add that my 35R is Aspec's modified GT500.... However, it is still a T3 on stock port engine.
Are you sure? I thought the 500r was T4 only from aspec. That turbo is a different animal than the 3582r. Gonna need more fuel at the same boost levels. More power with more lag.
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Old Mar 4, 2012 | 07:30 AM
  #35  
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Originally Posted by xboxthug13b
Seems like alot of old school tuners dont like the idea of a.i.
From a customer standpoint that makes zero sense to me. Tune should not be altered. The average street car joe should set it up as to where the tune isnt affected. For knock purposes only. Water and or water and a small amount of meth. mixed. It just depends on what ignition you want to get into to help prevent power loss on the amount you spray.
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Old Mar 4, 2012 | 09:13 AM
  #36  
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Have you concidered 350 may have just been a conservative estimate. This way when you hit 400 your thrilled instead of being disappointed if the car cones up a few hp short.
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