454 build and dyno test
 

Been busy doing 5 different bbc builds and dynoing. Doing current test starting today on my dyno. Pair of 1998 gen6 454s. I flowed and cleaned stock keihan injectors, bored motors .030 over to 460 cu inches, modified mpi intakes by cutting down the runners, dividers and blended entrys. Did a porting cleanup, converted heads to 11/32nd valve's, going to start w a tpis twin 68 mm bored out throttle body w a spare plenum w entry ground out to match bigger throttle body, firing swap cam w similar numbers to a 500 efi from bob m, 9cc domed pistons at 8.9-1 compression. Kevko 10 qt oil pans, eagle rods, dui ignirion modules. Motors converted to mefi3 w re-pinned mefi1 harnesses and knock control modules removed (done thru ecu on mefi3). The heads flowed about 310 intake and 220 exhaust after completed @.600 lift. Will post up results later, smitty

Used afrs tuliped, inconel exh valves, in back to back flow testing on norms flow bench they were worth about 10 cfm almost everywhere.

Looking forward to the numbers.... Marine trim dyno? I'll take 518hp...

Dry dyno headers, j607 cf, i expect 500 to 520hp, will be more like 475 real world hp IF it was going in boat after this in this configuration BUT there are more mods being done as i progress!

That's pretty darn good gains for a pretty simple 454 MPI build! Can't wait to see the results!

Ron, when you take away the diff between j607 and 1349 , a little over 15 hp, dry dyno headers and no pulleys , your talking 80 to 100 hp gain. Porting iron heads sucks, was going to be minor upgrades to heads but by time i ported them, had guides redone for 11/32, surfacing, valve job, converting rocker threads to 7/16 a set of EQ heads would have been a better direction to go! These mag motors have itty, bitty cams stock, just a cam change would have been a big difference. The throttle body, intake work etc might not even make much of a difference on only 460 cu inches but hey, why not! The mods WILL help when i bolt the whipple sidemounts on though after i break these in and see how good they are NA, Smitty

After i tune this na the whipple sidemounts are going on. Theres alot of bad press about them BUT when they came out no one was really tuning them perfect AND they all ended up on motors that were needing a bigger supercharger. These 460 bbc are a good candidate for them. I tuned a hp 500efi with one on water last year and after dialing it in it really ran pretty good.

Didn't those have auxiliary injectors ?
I'm sure auxiliary injectors and intake runners starting above the plenum floor didn't help.

per Eddie youngs advice this ones getting 2 80 lb auxiliary injectors too

Spent good part of day sorting thru minor problem's. Im using stock valve covers w .310 gaskets, tabs ground and cut out on these motors, tall ones wont clear the inercooler later, still waiting on gaskets to show up So i stuck a set of tall dart race valve covers on for now. Ive ran thesr w no issues on other bbc's. Well, on this one it had a strange noise in valve train. Pulled all o2 sensor wires out of the way, tore off valve covers, relashed the valves. Still noisy. Pulled vslve covers again, found tiny marks on them where rocker arms were hitting them on intake manifold side
held a straight edge acrossed bolt holes on both head and valve covers. Casting on vcovers sticks in MORE than cast iron on head. Swapped on other valve covers, noise gone!

I like mine,been running perfect for 12,now 13yrs.my intakes are highly modified,make alot of tq.mine are mefi4b's.look forward to some numbers.

So we did get dyno runs in, started w my tune i did on 502 i built to sell my baja w that made 563 hp (flat top piston, iron heads that were slightly modded, highly modded mpi intake, twin 68 mm tb from tpis, 500efi cam).
So we were expecting 520ish hp, first mini pull to 5200 we made 518 w afrs in 11s. Took a little fuel out, pulled higher and higher progressively. This thing peaked at 5800/5900 and pulled easily to 6000.
Our dyno has two sets of software running independent of each other, depac and perf trends. On the depac we saw 573 hp at 5800, 558 ft lbs tq at 4800, bsfcs in the .54 range. Cf was 1.095 using j607. Ambient was in mid 90s yesterday here and humidity was fairly high. On perf trends, we saw 553 hp at 5800 and 548 ft lbs tq at 4100/545 at 4800https://cimg1.ibsrv.net/gimg/www.off...76e7fef1a3.jpg

https://cimg6.ibsrv.net/gimg/www.off...e496321551.jpgperf trends data

https://cimg5.ibsrv.net/gimg/www.off...90e1d0d07e.jpg
More. Afr spread was minmal too, double firing swap cam helped im sure, double fired unjectors vs single firing them too

So it made about 50hp more than expected ?, what will the whipple ad 100-125

this thing responded real well to the double fire swap cam, head work i did and intake work/bored throttle body. I did NOT think we'd see much more than 520 though. I was real aggressive on intake mods, willing to give up some na torque since were bolting whipple sidemounts on anyways. Tq was about same as last couple of mild 502s i dynoed minus the 9 or 10% from cubic inch difference. https://cimg4.ibsrv.net/gimg/www.off...f9b15a6917.jpg
https://cimg4.ibsrv.net/gimg/www.off...8c108b4328.jpg

nice job, btw Im still sending you my 2 sets of injectors, got side tracked with a boat issue..........imagine that....

Any pics of the TB setup and what was the AFR you made best HP at? What AFR did you find best TQ at?

final pulls were at 12.0 to 13.2 acrossed all 8 cylinders, would have shown about a 12.5/12.6 tailpipe average. Might have made a few hp.more at 13.0/ 13.2 average but since it would be too lean for in boat and this was to establish baseline hp i didnt chase it. Afrs thru lower peak tq were in low 13's dropping to mid 12s, in past i found a little more tq by fattening tq peak up to low to mod 12s, again, didnt chase it since im retuning it anyways w blowerhttps://cimg4.ibsrv.net/gimg/www.off...0743614945.jpg

i did not bore notch it, yes, the tune will be waaaay off after boosting it. Making fuel rails today for both whipples aux injectors https://cimg8.ibsrv.net/gimg/www.off...5fc99c3ed0.jpg

Thanks!

Have you done any back to back testing of the TPIS TB vs the stock one? They look identical with the exception of the stock one is like 63 or 65 mm.

What Kehien injectors (size and model)? Sorry for all the questions....

stock 42 lb keihan 454/502 injectors (early mefi used)
a stock tb is twin 60.mm, the tpis is twin 68mm. Years ago i had 3 of them bored to twin 65 mm, in back to back dyno testing on a 540 i saw 12 hp or so, then more yet w the twin 68. i did extensive testing two years ago on a mildly modded 502 mpi,i dont remember the exact numbers but i tried 3 different tbdl's and a ton of flame arrestors, I posted all the results on here too.
the tpis tb is actually bigger than stock plenum opening, first time i tried running one i didnt bother to port the plenum and it created problems. Heres pic of one modded 90% of way for the 68 mm tb, i had roughed this one in and still had to pretty it up.
I didn't open up my cutomers 454 plenums for the tb test since i wanted the plenum as intact as possible when we hang the ehipple sidemounts on so i whittled up a spare 502 plenumhttps://cimg6.ibsrv.net/gimg/www.off...eb67a31f52.jpg

Smitty, on the phone yesterday I forgot to ask you what octane are you dynoing? I run 89, but I use to run 87 in my Panther with my current builds. Going to do a 50/50 mix next fill up.

8.9-1, ran 89 octane, zero hint of KR

Smitty, did you nix the knock control just for the dyno pulls, but will reinable when it goes on the water.

i flowed and cleaned the stock keihans, prob not enough injector there for the hp of motor w blower. Talking to eddie young and based on another one i tuned on a hp 500 (2.3 sidemount) he told me the extra injectors will help cool the rotors and seal them and thats how he has had reliable results. As far as driving them, i bought ev-1 style injector plugs and im going to tie them into each batch and fire 5 and 5. I have to extend the tps wiring and iac wiring anyways so not too bad of a job.

I ran WITH knock sensor enabled, no signs of KR on 89 octane, once in a while you WILL see knock on dyno but not on water but not very often.

https://cimg2.ibsrv.net/gimg/www.off...b67683f68a.jpg
Boosted, biggest pulley (3 1/8). I think the crank pulley is for a 3.3, sees 7.5 psi boost around 4000, tapers to 7 by 5800.
724 ft lbs tq, 753 hp, 9.5 cf at j607. Going to try next size smaller pulley, my dynos rated at 1000 hp, at 3500 the brakes not controlling the 700+ft lbs of tq once its hot so might not work.
fashioned a air duct to get cooler sir to tb, was seeing 120+degrees intake yesterday fwiw.

https://cimg2.ibsrv.net/gimg/www.off...49e6fb0737.jpg
Picture of dynorun printout w big pulley

Ihttps://cimg5.ibsrv.net/gimg/www.off...3f2f51965e.jpg
2 7/8 pulley (medium) thru mufflers, made 9.55 lbs boost, a mefi3 boost multiplier table ends at 7.35, went from mid 11 afrs to mid 12s, owner does NOT want to try little pulley, i dont really feel like rewriting tune anyways for a pulley he's not going to ever run. Thought about pulling mufflers, would defiantly need more fuel, would have banged 800 then. Saw 800 on depac (the frc, ie, friction factor adds a little fwiw. The bore is wrong on printout, oso wont let me edit photo, i just saw it rereading it, still learning new software

Ffixed the printout, it reverted to a different bore from a std file from previous 502https://cimg0.ibsrv.net/gimg/www.off...19e689600c.jpg

Thats impressive........Whipple claims 750-775hp with the 3.3 on the 525 EFI.............with a cooler....8-65lbs injectors in the rail

this has 2 80 lb injectors and 8 42 lb injectors, total of 496 lbs, the 8 65s comes to 520. This cam is better than 525 efi, heads are ported but less cubes. I bet the whipple on 502 525 makes a bunch more tq too

we also saw 9.55 lbs boost with med pulley, with this dinky innercooler i wouldnt be inclined to put it in boat with that, saw 58 celcius intake temp

What do you think the fuel efficiency is compared to Roots, Procharger/Vortech, Whipple? In between roots and Pro/Vor?

whipple fuel consumption sucks in my opinion. Bsfcs at 11.5/12.0 afr were in mid
.600 to close to .700 during these runs. I saw bsfcs on dyno w procharger closer to .500 to .580 so were talking 20% more fuel. Now, did adding the extra injectors before blower like a roots carbed motor fire hosing fuel in hurt bsfc, prob but didnt see kr even in the 9.5 lb boost run at 12.5 afr so its giving some latent cooling i think.