denmah

iTrader: (2)

this turbo is making the same power the 88.83 did on my other car so far lol

dirtylark71

iTrader: (2)

78/75 for the win! I'm convinced.

Tjabo

Pre-turbo water/meth injection to make more power Matt!! Lol

douglee25

Wow those are some amazing numbers!

SLOW SEDAN

iTrader: (13)

At the same boost/timing on the same size engine with the same cam? Just curious if its a apples to apples comparison.

The 88/83 doesn't seem to have a problem making 800+ in other cars and the 78/75 appears to be falling off at 700. I guess if 700 is the end goal then the 78/75 fits the bill for sure!

Another question... if the 78/75 is making 11-13hp/lb and takes 20lbs to get to 700, but the 88/83 makes double the hp/lb and can do 700 at lower boost which would you rather have?

Photochop

iTrader: (74)

Keep in mind pump gas, no meth, no E. Did the 800+ cars with the bigger turbo do that on pump gas?

ls3fox

Iirc the 88 made 740 at 23-24 lbs with meth and he just made 700 at 20lbs with the 78 no meth

coltboostin

At the same timing and boost a car will make more HP on pump gas. E just gives you the wider tuning window to turn it up.

Still a different car/cam/set up. Almost impossible to compare.

Maybe VS will send him one to do a true back to back

SLOW SEDAN

iTrader: (13)

The 88 was on a 5.3L, the 78 is on a 6.0L.


That would be cool!

stock48

iTrader: (17)

Complete opposite from what I have found..... I've seen a solid 3~4 tenths and same mph at the track from pump gas switching to E85 even with same amount of boost, and timing. Only time I could see this even being close is on a lower boost setup with really cool ambient air, or a really efficient ice water chiller.

stock48

iTrader: (17)

Which one is going to run faster at the track in his 3700 lb truck off the foot brake??

Forcefed86

iTrader: (4)

Yea lots of tests done… NA cars with zero tune changes pick up roughly 3% power on e85. Adjusting timing at that point usually nets more… According to GM and a million other articles I’ve read anyway. All that just compounds with boost.

SLOW SEDAN

iTrader: (13)

Good question!

I'm not sure about a 3,700lb truck or the 78/75... but if the 78/75 flows anything like the PT7675CEA on my 4000+lb car then I would guess the 88/83 would be faster down the track off the foot brake.

I recently went through a swap from a 76/75 to an 88/83. The 88 showed no loss on the low end since they 60' the same, was quicker/faster to the 1/8th and the 1/4, ET dropped and trap speed picked up 5MPH.

3 window

iTrader: (1)

I'd like to see the two graphs side by side, if they exist. I'll take more midrange/usable power. You can have the peak horsepower number. My guess is the 78/75 for the heavier truck. JMO.

jaydubb

Wow dude... you are EVERYWHERE. LOL! This is James with the Silver G8... LOL

gtfoxy

Denmah & Stock48:

I see you use the Deka 80lbers a lot. Have you done any comparisons between those & the Racetronix 850's? For $500 difference I would expect some performance to be had or is that not your findings?

Tjabo

What size engine? Also, were these Precision turbos you're talking about, or chinese variants? (Or a Precision swapped out for a chinese?) Interesting!

SLOW SEDAN

iTrader: (13)

Howdy!

5.3L, the 76/75 was a Precision and the 88/83 is an On3.

Tjabo

WHOA!! Lol

denmah

iTrader: (2)

never used the race tronics, sorry