Jump to content
Ultimate Subaru Message Board

Differences in pre 1987 EA82T and post 1987 EA82T


Recommended Posts

87.5 xt turbo's got the spider intake and like 30 more hp, a little off topic but it's what i know for certian

 

Don't think they got any extra power. Definitely not 30.. Maybe 3-4 because of better flow, but otherwise everything is the same as the non spider motors (injectors, fuel pump, boost levels and such)

Link to comment
Share on other sites

no real power differences (maybe like 1-2 hp), MAF is different, disty, and a few bolt on stuff. Yes, pre '87 had gen 1 heads for sure, most of them up to '88 did when they started using gen 2 heads and gen 3 heads, are mainly current NOS and replacements for cars under warranty back in the day (like '90). Cams were also different I believe and there's something else I think is different but I cannot remember. Blocks are all the same, heads are the same, cam cases and covers are the same, intakes I believe are the same and so is the exhaust and the turbo as well.

Link to comment
Share on other sites

I knew the MAF sensors were different, but what makes them different? I'm assuming that most parts are interchangable between to two?

 

The MAF's are completely different (as in different theory of operation - one uses a hot wire, and the other a flapper door), as are the distributors, so the ECU, and the parts of the wireing harness used for those components are too. Most other parts probably would interchange fine.

 

GD

Link to comment
Share on other sites

I got curious about this, so I went and compared the 86 FSM to the 88 FSM.

 

The differences I noticed:

MAF - Old system is flapper, new is hot-wire

Distributor - Old system is hall effect w/ vac advance, new is optical, timing controlled by ECU

Knock Sensor - Old system has two wire, new has one

TPS - Old system TPS just has an Idle switch, and fully open switch. New has an extra potentiometer to determine throttle position

WGDS - Old system the wastegate is a direct hookup. New has a solenoid that slightly controls boost. I think its an altitude compensation thing.

Pressure Switch - Old system has one and uses it as a fuel cutoff. New one doesn't, and uses the MAF signal to determine fuel cutoff.

 

Everything else seemed to look like it worked the same. SO, theoretically one could swap those parts on to their 85-86 and the ECU, and you could gain a small amount.

Link to comment
Share on other sites

I got curious about this, so I went and compared the 86 FSM to the 88 FSM.

 

The differences I noticed:

MAF - Old system is flapper, new is hot-wire

Distributor - Old system is hall effect w/ vac advance, new is optical, timing controlled by ECU

Knock Sensor - Old system has two wire, new has one

TPS - Old system TPS just has an Idle switch, and fully open switch. New has an extra potentiometer to determine throttle position

WGDS - Old system the wastegate is a direct hookup. New has a solenoid that slightly controls boost. I think its an altitude compensation thing.

Pressure Switch - Old system has one and uses it as a fuel cutoff. New one doesn't, and uses the MAF signal to determine fuel cutoff.

 

Everything else seemed to look like it worked the same. SO, theoretically one could swap those parts on to their 85-86 and the ECU, and you could gain a small amount.

 

Thats what I was looking at. The biggest thing would be cuting the connecters for the ECU off the newer wire harness and putting them on the older wire harness because they don't plug into the same places.

Link to comment
Share on other sites

you said the pre87 models had a direct waste gate control and 87+ had a boost solinoid? well, I have a '88 XT with spider and hotwire, but without a boost solinoid? :confused: how can this be? perhaps because it a euro? (yet another difference to add to the list)

 

Correct.. the euro model EA82 runs on a different set of rules than USDM.

 

IIRC, the EDM models came out at 136hp

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...