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Search: Posts Made By: tpepmeie
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Forum: C4 ZR-1 Discussion
11-26-2023, 04:22 PM
Replies: 14
Views: 1,055
Posted By tpepmeie

Not quite, Ron. I have dyno sheets for this...

Not quite, Ron. I have dyno sheets for this motor, in unrestricted form.
620 bhp @ 7000
485 lb ft @ 6000

in sprint race trim the power was quoted as 570 bhp using a 35.2mm restrictor. That was...
Forum: C4 ZR-1 Discussion
08-27-2022, 11:55 AM
Replies: 30
Views: 2,786
Posted By tpepmeie

427 LT5 normally aspirated, 12:1 cr, 645 rwhp...

427 LT5 normally aspirated, 12:1 cr, 645 rwhp consistently on several dynos on different days..
Forum: C4 ZR-1 Discussion
11-21-2021, 08:28 AM
Replies: 743
Views: 144,854
Posted By tpepmeie

Thanks so much for sharing. I love these videos....

Thanks so much for sharing. I love these videos. What was the rpm over that last mile? 7800? Ciouldn't read the dash.
Forum: C4 ZR-1 Discussion
08-18-2021, 10:32 AM
Replies: 23
Views: 1,430
Posted By tpepmeie

Maybe look at the "24 lb" Bosch III's which I...

Maybe look at the "24 lb" Bosch III's which I think are grey? There might be smaller ones, but tuning 24s should be no problem.
Forum: C4 ZR-1 Discussion
08-18-2021, 10:19 AM
Replies: 23
Views: 1,430
Posted By tpepmeie

How much HP are you trying to feed? Are the...

How much HP are you trying to feed? Are the injector characterization tables provided with the Delphis?
Forum: C4 ZR-1 Discussion
08-18-2021, 09:42 AM
Replies: 23
Views: 1,430
Posted By tpepmeie

Jeff, Genuine Bosch III's are getting hard to...

Jeff,
Genuine Bosch III's are getting hard to find in the aftermarket. The last set of white 868's I got was from FIC, I think FiveOMotorsport also carries the OEM versions. But they are getting...
Forum: C4 ZR-1 Discussion
08-16-2021, 05:17 PM
Replies: 23
Views: 1,430
Posted By tpepmeie

Don't expect more power on an N/A engine, unless...

Don't expect more power on an N/A engine, unless you are octane limited at 12:1, and can't run optimal timing. At higher compression, E85 is a cheaper alternative to get out of the knock limitations...
Forum: C4 ZR-1 Discussion
08-09-2021, 01:31 PM
Replies: 23
Views: 1,430
Posted By tpepmeie

I did initially. Obviously need to change the...

I did initially. Obviously need to change the Stoich constant, but otherwise fine. I got bored with the stock ECU so changed to a Life Racing F88. :)


If you do it, you'll want to make sure you...
Forum: C4 ZR-1 Discussion
08-09-2021, 01:02 PM
Replies: 23
Views: 1,430
Posted By tpepmeie

Dom, both. I ran originally on Bosch 30 Reds,...

Dom, both. I ran originally on Bosch 30 Reds, stock fuel pressure. Then also same injectors at 75 psi rail pressure. Both were very crisp and clean with proper tuning. Unfortunately never got the...
Forum: C4 ZR-1 Discussion
08-09-2021, 11:58 AM
Replies: 23
Views: 1,430
Posted By tpepmeie

I did pump E85 on the shop 427 last summer. ...

I did pump E85 on the shop 427 last summer. Calibration changes required of course. I would not expect much power N/A, however, the shop sure smells better on that fuel. LOL. I started out with a...
Forum: C4 ZR-1 Discussion
07-08-2021, 09:47 AM
Replies: 1
Views: 286
Posted By tpepmeie

post holiday bump. please contact me with any...

post holiday bump. please contact me with any leads.
Thanks,
Todd
Forum: C4 ZR-1 Discussion
06-28-2021, 01:06 PM
Replies: 1
Views: 286
Posted By tpepmeie

WTB 93-95 oil pickup tube parts

Wanted: 4-bolt style (93-95) oil pump pickup tube. And the windage tray. Both are unique to 4-bolt motors.
Any leads appreciated!
Todd
Forum: C4 ZR-1 Discussion
06-26-2021, 10:53 AM
Replies: 23
Views: 1,430
Posted By tpepmeie

I usually recommend the Bosch Gen III's. I have...

I usually recommend the Bosch Gen III's. I have used the Red 30 lb'ers, at 700 chp, they had trouble keeping up frankly. Upgraded to the white 42 lb'ers to run E85 and more power, and less duty...
Forum: C4 ZR-1 Discussion
06-14-2021, 05:34 PM
Replies: 0
Views: 366
Posted By tpepmeie

Head Studs group buy

Last call, we're starting a new batch next week.

I have sourced high quality cylinder head studs for our engines. The material would be 13-8ph steel-- higher strength than ARP2000. These are...
Forum: C4 ZR-1 Discussion
06-08-2021, 10:30 AM
Replies: 6
Views: 1,437
Posted By tpepmeie

We have run these with both the lightweight INA...

We have run these with both the lightweight INA followers, OEM followers, and OEM replacement followers. You have to be careful with the OEM replacements. Stem height can vary as well as surface...
Forum: C4 ZR-1 Discussion
09-02-2020, 03:47 PM
Replies: 27
Views: 5,853
Posted By tpepmeie

Phil, did you get that baby on the dyno yet? It...

Phil, did you get that baby on the dyno yet? It looks incredibly clean, good install!
Forum: C4 ZR-1 Discussion
03-16-2019, 04:53 PM
Replies: 12
Views: 1,388
Posted By tpepmeie

Paul, you've recently posted asking for leads on...

Paul, you've recently posted asking for leads on both a 4" crank and the head/main studs I sell. I have all of these in stock or can replenish in a short time. I sent you a quote for your proposed...
Forum: C4 ZR-1 Discussion
02-09-2019, 09:09 AM
Replies: 9
Views: 1,655
Posted By tpepmeie

Hello, John. Very good research into the salient...

Hello, John. Very good research into the salient differences between the open deck and closed deck configuration. Please know that none of us who build these engines are getting rich at your...
Forum: C4 ZR-1 Discussion
02-07-2019, 06:49 PM
Replies: 40
Views: 6,370
Posted By tpepmeie

600 crank hp does not require the big bore,...

600 crank hp does not require the big bore, closed deck short block. It is done with a 6.0L 368 cid, with the right cams and induction. I've done two in the last 24 months. Not many (any?)...
Forum: C4 ZR-1 Discussion
02-06-2019, 06:40 PM
Replies: 9
Views: 1,655
Posted By tpepmeie

You mean a drop in closed deck 4.000 bore? That...

You mean a drop in closed deck 4.000 bore? That is something I might consider. But...… why? I'm not seeing the need for the closed deck unless you're doing something very radical like extreme boost....
Forum: C4 ZR-1 Discussion
08-24-2018, 09:54 AM
Replies: 11
Views: 1,852
Posted By tpepmeie

I'm going to say Watson, but just a guess.

I'm going to say Watson, but just a guess.
Forum: C4 ZR-1 Discussion
07-17-2018, 07:59 PM
Replies: 44
Views: 4,136
Posted By tpepmeie

Dwight, Glad to hear the race car ran well. ...

Dwight, Glad to hear the race car ran well. There's more left in it, I'm sure.

Ron, good luck man. I assume you're leaving the bottom end untouched, and just tweaking the top end a bit?
Forum: C4 ZR-1 Discussion
04-20-2018, 04:24 PM
Replies: 31
Views: 7,352
Posted By tpepmeie

Yes the problem is the TB is too small. Seen it...

Yes the problem is the TB is too small. Seen it more than once on engines which pump a lot of air. I think we’ve taken this thread down a hole the OP didn’t intend. Sorry.
Forum: C4 ZR-1 Discussion
04-20-2018, 11:52 AM
Replies: 31
Views: 7,352
Posted By tpepmeie

A 427 at 7000 rpms pulls almost 1.5” manifold...

A 427 at 7000 rpms pulls almost 1.5” manifold vacuum through a dual 63.5mm ported TB. At least mine did. On another engine, 368, was around 1.0” vac through a similarly ported TB.
Forum: C4 ZR-1 Discussion
04-20-2018, 10:36 AM
Replies: 31
Views: 7,352
Posted By tpepmeie

Actually, no it isn’t. The lines plumbed into...

Actually, no it isn’t. The lines plumbed into the air filter housing in front of the samco duct are a wet nitrous system. Unless we’re talking about two different images. I’m referring to the...
Showing results 1 to 25 of 194
 
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