Hi Speeders,
As some knows I upgraded my engine from 66mm VTGs to Alpha3071s recently.
I didn't share yet because I wanted to wait for an improved system before.
The kit is from Protomotive and I'm very happy with it, we did dozens of logs to proper tune it.
Last tune is very clean, consistent lambda and timing, @1.35bar peak boost "only" because I run only 98 or 100 pumpgas.
Times were 5.5'/19.5' at 100-200/300, 2 persons in, 21-23°c AT.

Last wednesday I felt the car a bit weaky, little smoke but no mechanic noise at all...
At once I sent the car to my techs to check it, one cylinder was out of compression.
They open the engine today and found....2 bent rods! (at least, visual inspection)
I have to say I often run 5th and 6th gear pulls.
I was logging when issue arrived and Todd confirms no knocking before the failure (end 5th).

My thought is stock internals can certainly hold XXX torque/power if you wanna run short pulls as 3rd and 4rth gear, but not if you wanna run "long" pulls as 5th and 6th...
I didn't dynoed the car but I guess it puts about 700-750Hp and 950Nm, at the crank, anyway I will dyno it when rebuilt.

Some will tell me it's all about the tune, don't you trust in TK here!?
I believe standalone ECU or not (at least a good tune of course), pressure on the pistons stays pressure, no pressure no torque, and no torque no power...

P.

FriendlyPS to "337.7 man", Rui: my friend save for rebuilding your engine if you wanna run high speeds!

 

Thanks for sharing Pascal.

It's a shame it let go.

I guess this is why FVD only reccomend stage 3 as the limit on a stock engine because their kits are developed to run high speed consistently and not just the occasional high speed run.

 

Wow, I'm sorry to hear that happened. I'm hoping the E85 that I will be running will be the difference from my engine letting go. I will def be pushing her hard at the event October 5-6 so I should know shortly after that. Will be pushing her hard in 5th, maybe even 6th as well. Thanks for sharing, I know a lot of people that blow their motors like to keep it to themselves.

 

I agree that higher octane fuels such as E85 and MS109 will prolong the life of the engine and help reduce detonation BUT a rod only has so much strength and it what take long for it to bend IMO.

 

Thxs for the kind words,
I believe the term "long" pulls is not the true reason, a 100-300 doesn't exceed 20'...
It is not only the duration but as well the load which occurs in 5th and 6th that hurts the internals...
I will rebuild with stronger studs, heads gaskets, Carrillo rods...

 

Head studs are good upgrade , i swapped my old raceware with evoms studs , evoms were way better , hold the boost very well , as well as i ran stock OEM head gaskets with oring sleeves , running good till now ! Carrilo is better than my pauter rods , but more cost than pauter

Good luck bro

 

Sorry about your car.

I have also Protomotive tune and I run 1.35+ bar with A3076 and no problem till now...but I don t push the 6th to much.Always with 100oct euro spec pump gas!

The problem is not the ecu program-flash but the torgue!That s why I prefer the 76's ...less torgue at the mid range and more power on top!!

 

I check-log my car at 1.55 bar for some runs with durametrick Nick and A3076!!

No detonation at all with 100oct pump gas...

The problem is only the torque for the rods...nothing else!

Thats why i run 1.25 to 1.35 most of the time!

 

Yes i agree but i should obviously be more clear.

I know its the torque that destroys the engine i only mentioned fuel types because another member did!

Like i said a rod is only going to be as strong as it is made to be. You guys trying to run 700lbs plus on stock internals are going to go boom eventually.

I drive my car very hard and i don't think i would ever risk running more power than I have on stock motor after reading this!

P.s. you can check as many durametric logs as u like. If the engine parts are dieing it won't tell you that will it

 

I agree...thats why I will built my engine soon...I allready bought the carillo rods.

Your VTG's prodused also a lot of torque...more than 900NM so you must think about a set of rods

 

i know.

My engine is out atm and to fix coolant leak but im seriously considering a 3.8 ltr or 4.1 ltr kit.

 

Do the 3.8lt ! No need for 4.1lt...

 

Why do you think there is no need?

 

A lot of work and more risky for my opinion...

 

Not much more work you only have to machine the water housings a little.

Plus why more risky?