E85 with stock VVT NB2
#1
Elite Member
![](/mt2011/images_td/ranks/supporter1.gif)
Thread Starter
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,478
Total Cats: 144
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I'm lazy and don't want to search the details.
stock fuel system from a 99 (pump regulator, lines, etc) with a relatively stock NB2 VVT motor with NB2 VVT injectors some exhaust and intake upgrades. Assuming proper ECU tune for E85. Will the fuel system supply enough E85? or do I need upgrades there too?
stock fuel system from a 99 (pump regulator, lines, etc) with a relatively stock NB2 VVT motor with NB2 VVT injectors some exhaust and intake upgrades. Assuming proper ECU tune for E85. Will the fuel system supply enough E85? or do I need upgrades there too?
#7
SADFab Destructive Testing Engineer
![](/mt2011/images_td/ranks/supporter1.gif)
![](/mt2011/images_td/ranks/moderator.png)
iTrader: (5)
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 18,642
Total Cats: 1,866
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
https://www.miataturbo.net/engine-pe...jectors-86827/
https://www.miataturbo.net/engine-pe...e-gains-76251/
[NA] 135whp with stock NA8 long block - MX-5 Miata Forum
With the 60psi fuel system you should be fine.
https://www.miataturbo.net/engine-pe...e-gains-76251/
[NA] 135whp with stock NA8 long block - MX-5 Miata Forum
With the 60psi fuel system you should be fine.
#9
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I'm lazy and don't want to search the details.
stock fuel system from a 99 (pump regulator, lines, etc) with a relatively stock NB2 VVT motor with NB2 VVT injectors some exhaust and intake upgrades. Assuming proper ECU tune for E85. Will the fuel system supply enough E85? or do I need upgrades there too?
stock fuel system from a 99 (pump regulator, lines, etc) with a relatively stock NB2 VVT motor with NB2 VVT injectors some exhaust and intake upgrades. Assuming proper ECU tune for E85. Will the fuel system supply enough E85? or do I need upgrades there too?
__________________
#10
Elite Member
![](/mt2011/images_td/ranks/supporter1.gif)
Thread Starter
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,478
Total Cats: 144
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Because CSP car.
keep the parts coming.
#11
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Good setup. Play with VICS on/off all through the rev range. We found some nice gains with two switching points. NB2 injectors have a wee bit more capacity than NB1. SCCA legal built NB2 CSP motor can make about 168whp /140tq Djet SAE corrected on small tires, 225's. A tad less on 275's.
__________________
#12
Elite Member
![](/mt2011/images_td/ranks/supporter1.gif)
Thread Starter
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,478
Total Cats: 144
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Good setup. Play with VICS on/off all through the rev range. We found some nice gains with two switching points. NB2 injectors have a wee bit more capacity than NB1. SCCA legal built NB2 CSP motor can make about 168whp /140tq Djet SAE corrected on small tires, 225's. A tad less on 275's.
#13
Elite Member
![](/mt2011/images_td/ranks/supporter1.gif)
Thread Starter
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,478
Total Cats: 144
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Car made 150 hp today on 92 pump gas. Then swapped to E85 which was more like E78. Fiddled with timing and fuel ofsett tuning for corn. Car made almost no more power on corn maybe 3 ft-lbs in the mid range max Actually Lost power with more timing than we were using for pump and was hitting 100% duty cycle at about 5800 rpm.
#15
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Car made 150 hp today on 92 pump gas. Then swapped to E85 which was more like E78. Fiddled with timing and fuel ofsett tuning for corn. Car made almost no more power on corn maybe 3 ft-lbs in the mid range max Actually Lost power with more timing than we were using for pump and was hitting 100% duty cycle at about 5800 rpm.
You can just input -360° and it won't care unless you have big cams and lots overlap.
Safe gas tune is 12.8 near peak torque tapering to 13.0 at high rpm when VE drops off. Corn can run a tad richer, Lambda corrected to effective 12.5~12.8.
How much timing on top? Gas on an stock cam NB2 is usually about 32° =/- 2°. E85 I have seen stock cam NB1's and 2 keep making more torque/power until 38-40°
__________________
#16
Elite Member
![](/mt2011/images_td/ranks/supporter1.gif)
Thread Starter
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,478
Total Cats: 144
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Afr on corn was going to 15 with injectors at 100% duty. We were not making more power with more timing mid range corn or gas. up top gas we were up to 26-28 but more timing didnt make more power.
#17
Elite Member
![](/mt2011/images_td/ranks/supporter1.gif)
Thread Starter
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,478
Total Cats: 144
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Not unhappy with 150 on pump gas. Pretty strong for a stock motor. Fairly confident though our 99 fuel susten with stock 2002 injectors does not have capacity for jump to E85. Also based on the gains we were able to get at lower rpm tuning for E85. I think of we had enough injector E85 might only gain 5 ~10 hp. If we are lucky. Maybe its that North West pump gas is actually pretty good already. I know my beast won' t run for **** on anything out of a pump in California.
#18
Elite Member
![](/mt2011/images_td/ranks/supporter1.gif)
iTrader: (10)
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,987
Total Cats: 359
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Car made 150 hp today on 92 pump gas. Then swapped to E85 which was more like E78. Fiddled with timing and fuel ofsett tuning for corn. Car made almost no more power on corn maybe 3 ft-lbs in the mid range max Actually Lost power with more timing than we were using for pump and was hitting 100% duty cycle at about 5800 rpm.
#19
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
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.
#20
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
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.
__________________