383 lt1 dyno video

[Chevyguy358]

Here is a short clip of a dyno tune at straightline performance in IL. Its just a mild 383 with around 12:4:1 static and 9:3:1 dynamic compression. The tuner there spent much of the day setting up the parameters, I had to leave it there. Its being tuned for E85 due to the high compression and should be able to pick it up sometime this week. i should prolly update my sig

http://videos.streetfire.net/video/3...yno_166386.htm

The clip is short because if you listen carefully you can hear a slight pop at wot after which we checked the gapping on the plugs and they were too large for this much compression.

[slomarao]

Nice, what did it put down?

[Chevyguy358]

no numbers yet...will find out when i pick it up. I will let you guys know how the e85 tuning worked out as i know a few of you were curious

[texas94z]

What kind of gains are you expecting using 12.4:1 static compression w/ E85 compared compared to 11:1 w/ 93+ octane fuel? I am planning to build a high compression nitrous 355 using E85 for my dd.

[hsyr]

What kind of mods you got done to the motor other than the bottom end and what kind of HP level are you expecting out of it?

[Chevyguy358]

Originally Posted by texas94z

What kind of gains are you expecting using 12.4:1 static compression w/ E85 compared compared to 11:1 w/ 93+ octane fuel? I am planning to build a high compression nitrous 355 using E85 for my dd.

Well its really dependent on the DCR of the motor the higher the DCR the higher the potential for detonation. E85 is around 105 octane allowing for greater timing advance. If tuned correctly with a high DCR or a FI application i would expect 4-5% gains.

On a sadder note the tuner from the shop called today and said that the converter i am using is looser than most and causing a significant slip. Therefore the numbers its putting down arnt that impressive, not to mention its on a mustang dyno. He said he was unable to manually lock it. He did however say that it was putting down 360+ tq at the wheels before he started advancing the timing.

[Chevyguy358]

Originally Posted by hsyr

What kind of mods you got done to the motor other than the bottom end and what kind of HP level are you expecting out of it?

LT1 383 SHORTBLOCK –
SCAT 3.75 STROKE CRANKSHAFT
SCAT FORGED 5.7 I-BEAM RODS
SPEED PRO FORGED FLAT TOP PISTONS
TOTAL SEAL MOLY RINGS
CLEVITE 77 bearings
Felpro 1074 head gaskets (.039 in thick)
Custom ground cam .544/.555 lift 230/236 duration 112LSA
1.6 ratio full roller rockers
Ported stock heads with enlarged 2.02/1.06 valves
Has been milled around 53cc chambers (estimate) (12:4 CR)
Ported stock LT1 intake
37lb Delphi injectors flow matched
BBK 52mm throttle body
MSD coil
Meziere Electric water pump
Custom cold Air induction

Exhaust
Pacesetter long tube headers
Pacesetter Y pipe
Loud mouth I exhaust
Borla XR-1 3.5 in muffler

Transmission 4l60E
Rebuilt
Transgo shift kit
ACC Boss Hog 3200 stall converter

Rearend stock 7.5 10 bolt
Rebuilt with 3.73 richmond gearing

[texas94z]

Originally Posted by Chevyguy358

Well its really dependent on the DCR of the motor the higher the DCR the higher the potential for detonation. E85 is around 105 octane allowing for greater timing advance. If tuned correctly with a high DCR or a FI application i would expect 4-5% gains.

On a sadder note the tuner from the shop called today and said that the converter i am using is looser than most and causing a significant slip. Therefore the numbers its putting down arnt that impressive, not to mention its on a mustang dyno. He said he was unable to manually lock it. He did however say that it was putting down 360+ tq at the wheels before he started advancing the timing.

I see. 5 percent gains are not to shabby. Sucks about the converter.

[Chevyguy358]

If this motor wasn't having slipage through the converter i would ideally expect 380hp/400tq. As far as using E85 there are reports of people gaining much more than 5% but alot of people are relucant to believe it and there are many variables thats why I said 4-5%

[texas94z]

Are you planning to stay NA or maybe some nitrous down the road? I always wondered how nitrous would burn with e85. 106 octane and nitrous would match really well it seems.

[Chevyguy358]

yea when i get some money again i would like to spray....not too sure about how the E85 would affect that but i know my high compression will love it.

[slomarao]

the e85 will love n2o and will do great with it. It is 100+ octane so i would worry about it. I think its 103 or 104. But both the comp ratio and e85 will eat up that juice like nobodies business.

[quicksilver97ta]

Did you do anything else to the car to prepare for the E85? I've read it eats rubber and is even somewhat corrosive on some metals. Carbed cars have more issue with it having more rubber lines, needle and seats, and floats but I have also read about guys finded corrosion in the fuel bowls as well. I dont know how many o-rings or different metals might be exposed in our FI cars. They already put 10% in regular gas around here but going E85 is a big jump. My combo is similar to yours but I run a bigger cam and just run E10 @ 93 octane. I've thought about mixing E85 though.

[Chevyguy358]

Originally Posted by quicksilver97ta

Did you do anything else to the car to prepare for the E85? I've read it eats rubber and is even somewhat corrosive on some metals. Carbed cars have more issue with it having more rubber lines, needle and seats, and floats but I have also read about guys finded corrosion in the fuel bowls as well. I dont know how many o-rings or different metals might be exposed in our FI cars. They already put 10% in regular gas around here but going E85 is a big jump. My combo is similar to yours but I run a bigger cam and just run E10 @ 93 octane. I've thought about mixing E85 though.

Nah after researching it I realized that the corrosive nature of E85 is over rated and very few parts in a fbodys fuel sys contains rubber and other degradable materials. I guess i will find out here in a couple years.