427 supercharged stroker results at wheels.

Printable Version

Blazer Forum >> Modifications >> Performance & Brainstorming >> Nitrous, Super Chargers, & Turbos >> 427 supercharged stroker results at wheels.

Page: [1]

Login Message << Older Topic   Newer Topic >>

427 supercharged stroker results at wheels. - 5/17/2007 6:51:59 PM    erauto   Posts: 23 Joined: 4/19/2007 Status: offline hey guys, just got my dyno done today, very impressed, I have an 88 jimmy with a fully costom built 427 small block. little M block. just dynoed at 405 hp, 450ft.lbs. at the wheels. awsome throttle responce. engine made 707 at fly wheel. just lets you know how much power you lose through drive train. and yes it is supercharged with a vortec blower at 9psi. with methanol injection. _____________________________ 1988 JIMMY 427 little M, vortec blower,methanal injection, holley stealth ram 950. 700r4 manual reverse shift, B M shifter. good transfer case. Tru trac 373. 3 inch lift on 33s. Post #: 1

RE: 427 supercharged stroker results at wheels. - 5/17/2007 7:22:37 PM    swartlkk Posts: 14530 Joined: 5/1/2005 From: Waterloo, NY Status: offline Sounds amazing, but 303 HP lost in the drivetrain, that's huge!  That's a 42% loss through the drivetrain???  What did you use to determine that your engine produces 707HP? Just for a comparison, I engine dyno'd my 30 over 350 at 386hp/425ftlbs after I built it.  I then chassis dyno'd it with the stock TH350 and 10 bolt rear with 3.08 gears and the results were 304hp/332ftlbs a total ~21% loss through the entire drivetrain.  Now the curves didn't look exactly the same due to the presence of the fan, alternator, ps pump, etc...  42% seems just excessive... _____________________________ Kyle- 04 Rainier My Restoration Projects Please Do Not PM for Tech Help (in reply to erauto) Post #: 2

RE: 427 supercharged stroker results at wheels. - 5/17/2007 9:19:03 PM    Blazin_Jason Posts: 1067 Joined: 5/17/2006 From: Van Isl, B.C. Status: online Yeah that amount of power loss does seem high, but still lotsa power.  Any pics of the truck? _____________________________ 85 S10 Blazer 4x4, 2 door, undergoing 350 swap, 3" BL, 33''''s 89 Jimmy 4x4, 2 door, 4.3/auto (in reply to swartlkk) Post #: 3

RE: 427 supercharged stroker results at wheels. - 5/17/2007 11:59:54 PM    BLK85   Posts: 900 Joined: 12/20/2006 Status: offline 707 at the flywheel and 405 at the wheels?  I think you have some problems there.  _____________________________ 1999 Blazer 4x4 4 door 1998 Pontiac Firebird Formula-12.36@112mph 2007 Yamaha TTR230 (in reply to Blazin_Jason) Post #: 4

RE: 427 supercharged stroker results at wheels. - 5/18/2007 3:12:31 AM    lastcoupe Posts: 1137 Joined: 7/27/2006 Status: offline I agree...that is way too much loss....Are you sure the throttle cable is opening the plate all the way?.....you have to find those missing ponies! _____________________________ ASE & GM certified Pro Auto Technician (in reply to BLK85) Post #: 5

RE: 427 supercharged stroker results at wheels. - 5/18/2007 6:57:25 PM    erauto   Posts: 23 Joined: 4/19/2007 Status: offline OK. did  any guy here ever tryed a dyno??? I used to be a auto tech at a place called "extreme automotive"" and I used to be a tech for 1/4 drags cars. so If you think that 400 hp at the wheels is not enough, come here and I will get you for a ride, Iam talking about a full size blazer, sideways at 85km/hr. can smoke 33inch tires for a block... and ya, it takes 700 to do that..try arguing with the pros at campbellautomotive.com.  they dyno everyday.. check out the website. _____________________________ 1988 JIMMY 427 little M, vortec blower,methanal injection, holley stealth ram 950. 700r4 manual reverse shift, B M shifter. good transfer case. Tru trac 373. 3 inch lift on 33s. (in reply to lastcoupe) Post #: 6

RE: 427 supercharged stroker results at wheels. - 5/18/2007 7:11:13 PM    swartlkk Posts: 14530 Joined: 5/1/2005 From: Waterloo, NY Status: offline Did you read any of our posts???  Specifically my first post in this thread?  Those are hard numbers.  Congrats on the 400+ mark at the wheels, but 42% drivetrain loss is HUGE, plane and simple.  Could you answer my question?  How did you come up with the 707HP at the crank?  Was the engine dyno'd before being placed into the truck? Oh yeah, forgot to ask...  Do you have any pics of this truck?  Engine setup?  I'm thinkin' of going with a CSC on my Chevelle.  I'm very interested in what you've done. < Message edited by swartlkk -- 5/18/2007 7:18:12 PM > _____________________________ Kyle- 04 Rainier My Restoration Projects Please Do Not PM for Tech Help (in reply to erauto) Post #: 7

RE: 427 supercharged stroker results at wheels. - 5/18/2007 8:08:50 PM    erauto   Posts: 23 Joined: 4/19/2007 Status: offline Yes the engine was dynoed first without the chassis. It took alot to make 707 at the crank, first let me start with- dart little M block, 3.814 stroke, 6 inch rods, all eagle 4340. diamond forged pistons, costom roller camshaft, victor jr heads with ported 220cc intake runners, angle plug, monster headers-headman elite series, holley stealth ram intake system, added 9 psi boost, with twin methanol injection. the engine made 550 hp naturally aspired-no boost or methanol. 707 with boost and methanol at crank. the engine builders in edmonton tell me its naturual to loose 30-40% to the wheels on a full size 4 wheel drive. they also tell me its natural to loose 25-30 on a two wheel drive. If you compare gms zz502 killer, this 427 is the same power rating. pics are slim for now because of my tech background, iam a firm beleiver that powertrain first- then body. so here is some of it so far.  I also have video of the dyno if your interested but I have to email it to you. As far as 42% loss, it does not feel like it if you were to drive it. 400 to the wheel is enough to scare you, and enough to beat mustangs.!!!  Thumbnail Image Thumbnail Image Thumbnail Image Thumbnail Image Attachment (4) _____________________________ 1988 JIMMY 427 little M, vortec blower,methanal injection, holley stealth ram 950. 700r4 manual reverse shift, B M shifter. good transfer case. Tru trac 373. 3 inch lift on 33s. (in reply to swartlkk) Post #: 8

RE: 427 supercharged stroker results at wheels. - 5/19/2007 12:28:18 AM    BLK85   Posts: 900 Joined: 12/20/2006 Status: offline 42% loss does not sound right to me.  I've never heard of anyone having that much drivetrain loss.  But I'm not a Mecahnic or Engine Builder(just a hobby for me) for a living so I'll let the people that do this a lot mroe than me put there input.  Nice looking truck though. _____________________________ 1999 Blazer 4x4 4 door 1998 Pontiac Firebird Formula-12.36@112mph 2007 Yamaha TTR230 (in reply to erauto) Post #: 9

RE: 427 supercharged stroker results at wheels. - 5/19/2007 3:09:17 AM    drperry Posts: 3901 Joined: 1/12/2007 From: GP AB CA Status: offline On a chassis dyno, a 2wd and a 4wd will be fairly close... within 5% of each other... Unless the t-case is causing issues... Change out all your drivetrain fluids, make sure the tires are at the right PSI... 42% drivetrain loss isn't impossible... just not usual. With 3.73's you shouldn't hit more than 40% loss... As an average, you take 15% off of crank power for a FWD car, and 20 - 25% for the average RWD car... The t-case in a 4x4 might bump that up into the 30 - 35% range... The extra meat from the tires + rims might account for that extra percentage... still seems a little off to me as well, but not too far off... The transfer case and the tires are the major variables throwing off the numbers here... _____________________________ (in reply to BLK85) Post #: 10

RE: 427 supercharged stroker results at wheels. - 5/20/2007 7:20:10 AM    erauto   Posts: 23 Joined: 4/19/2007 Status: offline ok here is the rest of the story, after driving it for a day, every time I get into boost, a burning belt smell. after a call from campbell, those dyno specs were at 2 psi. the blower is out by 1/4 inch. problem fixed last night boost is up to 10 with no slipping. power is incredible. one day i will re dyno the chassis just to see how much I lose, as well, my 700r4 is not taking it so well anymore-in comes the 4l80.... _____________________________ 1988 JIMMY 427 little M, vortec blower,methanal injection, holley stealth ram 950. 700r4 manual reverse shift, B M shifter. good transfer case. Tru trac 373. 3 inch lift on 33s. (in reply to drperry) Post #: 11

RE: 427 supercharged stroker results at wheels. - 5/20/2007 1:08:18 PM    swartlkk Posts: 14530 Joined: 5/1/2005 From: Waterloo, NY Status: offline That definitely would explain it.  If the engine were dyno'd at 9psi and then on the chassis dyno at only 2psi, that is a significant difference.  And yeah, that would have been my next comment on the 700R4.  They aren't much good beyond 450 CHP unless you dump a ton of money into them.  Even the 4L80 may have some issues behind a 700CHP engine and now with 9-10psi of boost, you'll probably be up around 575 ftlbs to the wheels with methanol injection... _____________________________ Kyle- 04 Rainier My Restoration Projects Please Do Not PM for Tech Help (in reply to erauto) Post #: 12

RE: 427 supercharged stroker results at wheels. - 5/20/2007 1:32:47 PM    Blazin_Jason Posts: 1067 Joined: 5/17/2006 From: Van Isl, B.C. Status: online Time for a TH400 and a gear vendors overdrive kit.  That would be slick. _____________________________ 85 S10 Blazer 4x4, 2 door, undergoing 350 swap, 3" BL, 33''''s 89 Jimmy 4x4, 2 door, 4.3/auto (in reply to swartlkk) Post #: 13

Today's Posts
Most Active Topics
Make A Donation
Forum Rules & FAQ
RSS Feeds

Chevy Blazer Prices

Chevy Blazer
Trailblazer SS

Top 10 Posters
swartlkk 14530 drperry 3901 hanr3 3482 chevy lover 3411 m00nwater 3269 eurogoldls 3121 paddle_grl 2944 hillbillyino 2885 wolfpack 2844 xblazer01 2659

New Vendors
AMSOIL - Performance Oil Technology