First E85-Ethanol tuned R35 GTR makes BIG POWER!!!

[G-spec]

Not another one of those "hey look at this GTR" threads, serious business for serious gear heads below.

Pasted over from another forum, for those that don't know COBB tuning is one of the leading North American GTR tuners (I think with this test they've proven they are the best)
This also proves how technically advanced the GTR is, as it keeps surpassing everyone's expectations to this day, enjoy the read

Originally Posted by COBB Tuning

E85 is a blend of 85% ethanol and 15% gasoline. Originally developed as a bio-fuel for "flex fuel" domestic cars in the US, E85 has become the alternative fuel of choice for performance enthusiast. The allure of this biofuel comes from its high octane compared to regular pump fuels - 91 to 94 compared to 105 - and a very low price compared to higher octane race fuels. In many parts of the USA E85 costs as little as 2 dollars per gallon. When compared to 8 to 14 dollars quality high octane race fuels E85 represents a huge bargain.

If you don't know about E85 you're naturally asking the question "why am i not running e85 every day?". The answer is you can't. Most stock vehicles are not calibrated or equipped to utilize ethanol based fuels.

Despite having a higher octane rating, E85 has a lower overall energy density than pure pump fuel. Pure gasoline contains approximately 125,000 BTUs per gallon, while E85 contains approximately 84,000. This means that a greater volume of E85 must be utilized to realize the same energy content. This lower hydrocarbon content is mirrored by the stoichiometry of E85 and pure unleaded gasoline. Complete combustion of pure gasoline requires 14.7 parts air (mixed gas air with 23 percent oxygen) with one part fuel. In contrast, complete combustion of E85 requires a much higher relative content of fuel with only 9.7 parts air required. The distillation of this information means that larger volumes of E85 are required for equivalent combustion when compared to pure pump fuel. Thus, the cost savings associated with lower E85 prices is offset by an overall reduction in fuel economy. (taken from driving sports article "methanol injection vs E85" i wrote the article so i'm plagiarizing my own work. http://www.drivingsports.com/site/2008/07/...anol-injection/


The graph below shows the stochiometry of E85 (lamda) is similar for pump and E85 but the volume of fuel required for E85 is much higher by proportion (Air to fuel ratio).



Despite these limitation of E85 we wanted to tune our GTR to utilize this fuel. Together, the lower cost, higher octane, and higher overall power potential are simply too much to resist. Furthermore, because E85 has not been used in the new GTR platform I simply couldn't resist the technical challenge.

Because a stock GTR can use nearly 100% of its available injector capacity on pump fuel the first step in using E85 is to replace the stock injectors with larger units. We chose to use Deatschwerks 800cc injectors. These are ~30% larger than stock and should be able to provide the additional fuel volume needed for E85.

The injectors were installed and the car tuned on pump fuel:

Stock - completely stock calibration with 92 octane pump fuel - BLUE

Stage 2 800 cc - COBB catless midpipe, COBB prototype cat back exhaust, stock intake, stock fuel pump. - RED



We then drained the tank and refilled with E85 full. I adjusted the calibration with COBB AccessTUNER Pro software and prepared to run the car. The first few runs were done at low boost and all was well.

The calibration was then adjusted for higher boost and we attempted a full run. I aborted the run because the motor went progressively leaner at RPMs and fuel demand increased.


This increasing lean condition clearly points out a lack of fuel delivery. Because our injectors are mathematically ideal for ~30% higher flow it's clear that the stock fuel pumps simply cannot keep up with higher duty cycle with 800cc injectors.

To combat the lack of fuel we installed two walbro 255s in the place of the stock fuel pumps. The installation took about 4 hours total as the stock in tank fuel surge tank needed heavy but straightforward modification.

With new fuel pumps installed we went back to the dyno with high hopes of sufficient fuel delivery. The results are presented in the graph below.


Stock 2009 GTR - 92 octane - BLUE

Stage 2 800 cc - COBB catless midpipe, COBB prototype cat back exhaust, stock intake, stock fuel pump, 800 cc Deatschwerks injectors - RED

Stage 2 800cc - E85 - COBB catless midpipe, COBB prototype cat back exhaust, stock intake, Twin walbro 255 fuel pumps, 800 cc Deatschwerks injectors - GREEN

This E85 Stage 2 configuration is now the highest HP and torque stock turbo car tuned on our Mustang dyno. When the weather clears here in the pacific northwest we'll find some dry test roads and report V-box data. We're also planning to rent a local drag strip for development and testing so ETs and trap speeds are coming.

As a next step we plan to install some custom intakes. If our early observations are correct this car will make more than 600 whp on stock turbo's with E85.... all while retaining the factory downpipes.

Best regards
Tim Bailey
Lead GTR calibrator
Cobb Tuning SurgeLine
Lead GTR calibrator

[GabAlmighty]

Hennessy > All

[G-spec]

sorry but I'm gonna have to disagree, Hennessey just slaps on a pair of bigger turbos for an unstable, unsafe and unreliable 700hp and calls it a day loosely speaking.

The recent issues he's had with some of his customers coming out speaking against him have gotten to the point of lawsuits against his shop. I think as a result he's been dropped from some of the exotics forums as a sponsor and has lost a lot of credibility among that car community.

[Jackygor]

E85 is fucken awesome

[oinkoinkpig]

Originally Posted by Adon

sorry but I'm gonna have to disagree, Hennessey just slaps on a pair of bigger turbos for an unstable, unsafe and unreliable 700hp and calls it a day loosely speaking.

The recent issues he's had with some of his customers coming out speaking against him have gotten to the point of lawsuits against his shop. I think as a result he's been dropped from some of the exotics forums as a sponsor and has lost a lot of credibility among that car community.

you make him sound like Jun Kitami from maximum tune

[impactX]

Originally Posted by GabAlmighty

Hennessy > All

in terms of their lawsuits? yeah

[124Y]

Originally Posted by Jackygor

E85 is fucken awesome

Werd!!

[Mr.Jay]

Originally Posted by GabAlmighty

Hennessy > All

yep good place if you want parts from your car stolen and sold off.


Mines rules all but if its NA only than I agree with COBB beening the best

[hk20000]

Originally Posted by oinkoinkpig

you make him sound like Jun Kitami from maximum tune

LOL so true.

[achiam]

Hmm. Reading the OP, since the E85 requires higher burn rate than gas for same amount of BTU, doesn't this mean the carbon emissions should be higher?

[moomooCow]

^ I'm not educated in this sense at all but I assume the chemical composition of ethanol is very different from gasoline so even though you're burning more, the overall CO2 levels would be lower.


Upon googling... it seems ethanol might actually "burn dirtier" than gasoline??? Can anyone explain?

[RabidRat]

huh. 33% worse fuel efficiency it looks like (84kbtu/gal vs 125kbtu/gal). must run out of gas quick =D

[Presto]

Other than tuning the engine to work with E85, I didn't see any mention of changing/upgrading parts, like fuel lines, to accommodate the alcohol.