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Converting an l28 to an l28et?

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I'm sure this has been covered, but I couldn't for the life of me find any info on it. First off, is there any reason it shouldn't be done? And if not, what all is required? I can't find any l28et motors around me nor turbo 280zx donor cars to buy. I can, however, find relatively cheap NA 280zx donors. I know the l28s have a higher cr, but it doesn't seem like too big of a deal. What other parts and considerations are there?

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I turbocharged a stock bottom end L24 and L28. The L24 I blew due to detonation. Pistons cracked, and I was only running 8psi.

 

the L28, also running 8psi, ran for about a year before the rings gave out and I lost compression and oil.

 

i don’t recommend it... it leads to an unreliable short-lived engine. You really need to get the turbo pistons in there and lower the CR if you want it to survive. From what I remember, the turbo pistons have the rings lower to help keep them cooler. I can’t recall the precise reason, but the stock NA rings just don’t last long running boost. Obviously, you have the option to go custom forged pistons as well.

 

as a comparison, I put in an stock L28ET bottom end which then ran 300lbs of torque for 5 years without a problem. 500cc injectors, SDS RFI, intercooled, T3/T4 hybrid, 16psi. 
 

In my opinion, the aggregation and time lost in pulling the motor is not worth gambling with the NA pistons. 
 


 

 

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Hi there

I'm getting ready to rebuild my turbo engine and need some recommendation on rings. I used Hastings in my last 2 builds and in both (different blocks) I had some blowby. My first build (ITM pistons, Hastings rings, Clevite rod bearings, hole is piston #2 running 16psi) had worn rings after 6 or 7 thousand miles, made sure I had the turbo rings on the 2nd build (factory turbo pistons) and will have the checked when I tear it down.

 

Thanks

Simon

Edited by Zlost

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On 11/21/2020 at 6:31 AM, Zlost said:

Hi there

I'm getting ready to rebuild my turbo engine and need some recommendation on rings. I used Hastings in my last 2 builds and in both (different blocks) I had some blowby. My first build (ITM pistons, Hastings rings, Clevite rod bearings, hole is piston #2 running 16psi) had worn rings after 6 or 7 thousand miles, made sure I had the turbo rings on the 2nd build (factory turbo pistons) and will have the checked when I tear it down.

 

Thanks

Simon


have you pulled the stock L28et pistons yet? Curious to hear your impressions. I don’t have a recommendation on a specific ring material. Are you considering forged pistons? Since piston ring performance on a turbo engine is not specific to Nissan/Lseries, you could ask some of the experienced aftermarket piston suppliers like JE and see what they think. I believe the degree to which you experience pre-detonation (knocking) is the main culprit in short piston/ring life on an L28et. The higher the boost, the more ring wear you will experience but it should not be drastic unless you are knocking

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I have not opened it up yet, working on getting my garage built and want to drive it in when done (not push in) I hope to have it done in a month or so.

I agree, I must have been knocking really bad, I will be using another tuner this time around. I have another F54 block that I want to get sonic tested to see how far I can take it, they I will know what pistons to get. I plant to get the rings & pistons quoted this time around, and with a proper tune it should last this time.

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On 11/11/2020 at 11:25 PM, NewZed said:

Thanks for this info. Is anyone here running this kit? 

I'm looking to turbo my L28 and looking for info and options

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