E85 with stock VVT NB2
#21
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We are making over 130wtq and 150whp with e78 at 90% injector duty cycle on 01 injectors that were cleaned before install and a regulator from a NB at the rail. It made about +7 tq and hp at the wheels on corn. AFR's in the low to mid 13's seemed best as measured on the cars wbo2. This is uncorrected to uncorrected comparison on same dyno. The engine ecu was changed between the switch to corn so that may have had an impact and I suspect it did.
Because of the very small difference it looked like was going to make we aborted throwing more money at it tring to source bigger injectors while it was on the dyno swap them out and spend another day tuning.
#22
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Your post was a bit misleading. It sounded like your afr's were correct and you did not make power but clearly you completely ran out of injector so you don't know if the corn would make more power or not. NB FPR on stock NB2 has just enough headroom for E85. We find it varies from car to car. Out of probably 8 cars we have set up like that, two ran out of injector. NB1 is more likely to run out of injector then in be too because of cams and slightly smaller injector.
#23
I'll be going to bigger injectors soon to find out if e98 will make any more power and of course just to have some headroom as 90% dc is just too much.
I also would like to do a CSP engine build after Nats. I told myself I have to be somewhat competitive as the extra power won't do any good if I'm 3 seconds back. Then we'll see how close I can get to Emilio's estimate of 168/140. Or is that from first-hand knowledge?
I also would like to do a CSP engine build after Nats. I told myself I have to be somewhat competitive as the extra power won't do any good if I'm 3 seconds back. Then we'll see how close I can get to Emilio's estimate of 168/140. Or is that from first-hand knowledge?
#24
I presume you mean NA6, since NA8's can make that much on 93e10 . When I tired to tune for e85 I hit max duty cycle around 5000rpm's on my 97. AFR's would hangout around 12.8-13, but obviously the fuel was just pooling and it didn't feel right in the upper RPM's WOT. An already not smooth revving motor felt even more trucky.
#25
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Thought Id update this. after switching to Deatschwerks 450cc injectors and spending more time fine tuning both for 92-pump and E85 the E85 was good for about a 7 hp gain and with across the range gains everywhere. ~157 hp 143 ft-lbs blue is E85 red is 92pump.
#26
Please allow my to junk up this thread for a second. On a 95 with a VVT swap, could I replicate these results with the addition of a 99+ fuel pump? The motor with have a 99-00 fuel rail and NB2 injectors - at that point is the only missing piece a newer fuel pump, or are my factory lines an issue?
#27
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Its an NB2 VVT motor rebuilt with factory overbore and head shaved to minimum spec, with NB1 fuel system lines rail dampers regulator and all. added flex fuel sensor. 450cc injectors. Modified NB1 intake manifold with functioning VICS. few other secret sauce things that are all legal for the class.
Please allow my to junk up this thread for a second. On a 95 with a VVT swap, could I replicate these results with the addition of a 99+ fuel pump? The motor with have a 99-00 fuel rail and NB2 injectors - at that point is the only missing piece a newer fuel pump, or are my factory lines an issue?
#28
Its an NB2 VVT motor rebuilt with factory overbore and head shaved to minimum spec, with NB1 fuel system lines rail dampers regulator and all. added flex fuel sensor. 450cc injectors. Modified NB1 intake manifold with functioning VICS. few other secret sauce things that are all legal for the class.
#30
https://supermiata.com/Walbro-190LPH-HP-Fuel-Pump.aspx
And an external adjustable fuel pressure regulator (Turbosmart actually makes a really good unit) and you can hit pretty much any power that a reasonable N/A Miata engine is capable of.
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